55555556 has 36 divisors (see below), whose sum is σ = 112811328. Its totient is φ = 23449824.

The previous prime is 55555553. The next prime is 55555559. The reversal of 55555556 is 65555555.

It is an interprime number because it is at equal distance from previous prime (55555553) and next prime (55555559).

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332585 + ... + 332751.

It is an arithmetic number, because the mean of its divisors is an integer number (3133648).

Almost surely, 2^55555556 is an apocalyptic number.

It is an amenable number.

55555556 is an abundant number, since it is smaller than the sum of its proper divisors (57255772).

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

55555556 is a wasteful number, since it uses less digits than its factorization.

55555556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 285 counting only the distinct ones).

The product of its digits is 468750, while the sum is 41.

The square root of 55555556 is about 7453.5599548135. The cubic root of 55555556 is about 381.5714152020.

Subtracting 55555556 from its reverse (65555555), we obtain a palindrome (9999999).

It can be divided in two parts, 5555 and 5556, that added together give a palindrome (11111).

The spelling of 55555556 in words is "fifty-five million, five hundred fifty-five thousand, five hundred fifty-six".