55777555550 has 24 divisors (see below), whose sum is σ = 103752711336. Its totient is φ = 22309633440.

The previous prime is 55777555549. The next prime is 55777555579. The reversal of 55777555550 is 5555577755.

It is a super-2 number, since 2×55777555550² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1239749 + ... + 1283951.

It is an arithmetic number, because the mean of its divisors is an integer number (4323029639).

Almost surely, 2^55777555550 is an apocalyptic number.

55777555550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55777555550 is a deficient number, since it is larger than the sum of its proper divisors (47975155786).

55777555550 is a wasteful number, since it uses less digits than its factorization.

55777555550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69452 (or 69447 counting only the distinct ones).

The product of its (nonzero) digits is 26796875, while the sum is 56.

The spelling of 55777555550 in words is "fifty-five billion, seven hundred seventy-seven million, five hundred fifty-five thousand, five hundred fifty".