55778350581 has 12 divisors (see below), whose sum is σ = 80973599200. Its totient is φ = 36998703720.

The previous prime is 55778350553. The next prime is 55778350601. The reversal of 55778350581 is 18505387755.

55778350581 is a `hidden beast` number, since 5 + 5 + 7 + 7 + 8 + 3 + 50 + 581 = 666.

It is not a de Polignac number, because 55778350581 - 2²⁷ = 55644132853 is a prime.

It is a super-2 number, since 2×55778350581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778350081) 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, 15570055 + ... + 15573636.

Almost surely, 2^55778350581 is an apocalyptic number.

It is an amenable number.

55778350581 is a deficient number, since it is larger than the sum of its proper divisors (25195248619).

55778350581 is a wasteful number, since it uses less digits than its factorization.

55778350581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31143896 (or 31143893 counting only the distinct ones).

The product of its (nonzero) digits is 5880000, while the sum is 54.

The spelling of 55778350581 in words is "fifty-five billion, seven hundred seventy-eight million, three hundred fifty thousand, five hundred eighty-one".