55778480640 has 120 divisors (see below), whose sum is σ = 193176645948. Its totient is φ = 14874255360.

The previous prime is 55778480623. The next prime is 55778480663. The reversal of 55778480640 is 4608487755.

55778480640 is a `hidden beast` number, since 5 + 57 + 78 + 480 + 6 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51307686144 + 4470794496 = 226512^2 + 66864^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×55778480640² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1187431 + ... + 1233510.

Almost surely, 2^55778480640 is an apocalyptic number.

It is an amenable number.

55778480640 is an abundant number, since it is smaller than the sum of its proper divisors (137398165308).

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

55778480640 is a wasteful number, since it uses less digits than its factorization.

55778480640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420970 (or 2420951 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 54.

The spelling of 55778480640 in words is "fifty-five billion, seven hundred seventy-eight million, four hundred eighty thousand, six hundred forty".