55777656 has 64 divisors (see below), whose sum is σ = 154742400. Its totient is φ = 16611200.

The previous prime is 55777651. The next prime is 55777661. The reversal of 55777656 is 65677755.

55777656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55777651) and next prime (55777661).

It is a super-2 number, since 2×55777656² = 6222293817708672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55777651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13786 + ... + 17366.

It is an arithmetic number, because the mean of its divisors is an integer number (2417850).

Almost surely, 2^55777656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55777656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77371200).

55777656 is an abundant number, since it is smaller than the sum of its proper divisors (98964744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55777656 is a wasteful number, since it uses less digits than its factorization.

55777656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660 (or 3656 counting only the distinct ones).

The product of its digits is 1543500, while the sum is 48.

The square root of 55777656 is about 7468.4440146526. Note that the first 3 decimals coincide. The cubic root of 55777656 is about 382.0792211636.

Subtracting 55777656 from its reverse (65677755), we obtain a palindrome (9900099).

The spelling of 55777656 in words is "fifty-five million, seven hundred seventy-seven thousand, six hundred fifty-six".