77912157138 has 16 divisors (see below), whose sum is σ = 155938823136. Its totient is φ = 25951634240.

The previous prime is 77912157101. The next prime is 77912157143. The reversal of 77912157138 is 83175121977.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4762356 + ... + 4778687.

It is an arithmetic number, because the mean of its divisors is an integer number (9746176446).

Almost surely, 2^77912157138 is an apocalyptic number.

77912157138 is an abundant number, since it is smaller than the sum of its proper divisors (78026665998).

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

77912157138 is a wasteful number, since it uses less digits than its factorization.

77912157138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9542409.

The product of its digits is 740880, while the sum is 51.

The spelling of 77912157138 in words is "seventy-seven billion, nine hundred twelve million, one hundred fifty-seven thousand, one hundred thirty-eight".