55778449048 has 64 divisors (see below), whose sum is σ = 123898060800. Its totient is φ = 23036952960.

The previous prime is 55778449033. The next prime is 55778449049. The reversal of 55778449048 is 84094487755.

It is a super-2 number, since 2×55778449048² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778449049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347686 + ... + 482122.

It is an arithmetic number, because the mean of its divisors is an integer number (1935907200).

Almost surely, 2^55778449048 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 55778449048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61949030400).

55778449048 is an abundant number, since it is smaller than the sum of its proper divisors (68119611752).

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

55778449048 is a wasteful number, since it uses less digits than its factorization.

55778449048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134720 (or 134716 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 61.

The spelling of 55778449048 in words is "fifty-five billion, seven hundred seventy-eight million, four hundred forty-nine thousand, forty-eight".