53979178644 has 18 divisors (see below), whose sum is σ = 136447368330. Its totient is φ = 17993059536.

The previous prime is 53979178639. The next prime is 53979178663. The reversal of 53979178644 is 44687197935.

53979178644 is a `hidden beast` number, since 539 + 7 + 9 + 17 + 86 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52849412100 + 1129766544 = 229890^2 + 33612^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 749710779 + ... + 749710850.

Almost surely, 2^53979178644 is an apocalyptic number.

It is an amenable number.

53979178644 is an abundant number, since it is smaller than the sum of its proper divisors (82468189686).

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

53979178644 is a wasteful number, since it uses less digits than its factorization.

53979178644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499421639 (or 1499421634 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 53979178644 in words is "fifty-three billion, nine hundred seventy-nine million, one hundred seventy-eight thousand, six hundred forty-four".