55311778636772 has 48 divisors (see below), whose sum is σ = 113558429160960. Its totient is φ = 23084367800832.

The previous prime is 55311778636747. The next prime is 55311778636783. The reversal of 55311778636772 is 27763687711355.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171107873 + ... + 171430824.

It is an arithmetic number, because the mean of its divisors is an integer number (2365800607520).

Almost surely, 2^{55311778636772} is an apocalyptic number.

It is an amenable number.

55311778636772 is an abundant number, since it is smaller than the sum of its proper divisors (58246650524188).

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

55311778636772 is a wasteful number, since it uses less digits than its factorization.

55311778636772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342538860 (or 342538858 counting only the distinct ones).

The product of its digits is 311169600, while the sum is 68.

The spelling of 55311778636772 in words is "fifty-five trillion, three hundred eleven billion, seven hundred seventy-eight million, six hundred thirty-six thousand, seven hundred seventy-two".