55565938796778 has 16 divisors (see below), whose sum is σ = 123479863992960. Its totient is φ = 18521979598908.

The previous prime is 55565938796777. The next prime is 55565938796779. The reversal of 55565938796778 is 87769783956555.

55565938796778 is a `hidden beast` number, since 5 + 5 + 5 + 6 + 593 + 8 + 7 + 9 + 6 + 7 + 7 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (55565938796777) and next prime (55565938796779).

It is not an unprimeable number, because it can be changed into a prime (55565938796777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514499433250 + ... + 514499433357.

It is an arithmetic number, because the mean of its divisors is an integer number (7717491499560).

Almost surely, 2^{55565938796778} is an apocalyptic number.

55565938796778 is an abundant number, since it is smaller than the sum of its proper divisors (67913925196182).

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

55565938796778 is a wasteful number, since it uses less digits than its factorization.

55565938796778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028998866618 (or 1028998866612 counting only the distinct ones).

The product of its digits is 120022560000, while the sum is 90.

The spelling of 55565938796778 in words is "fifty-five trillion, five hundred sixty-five billion, nine hundred thirty-eight million, seven hundred ninety-six thousand, seven hundred seventy-eight".