78538056129 has 24 divisors (see below), whose sum is σ = 122201439360. Its totient is φ = 48318796512.

The previous prime is 78538056011. The next prime is 78538056143. The reversal of 78538056129 is 92165083587.

78538056129 is a `hidden beast` number, since 7 + 8 + 53 + 8 + 0 + 561 + 29 = 666.

It is not a de Polignac number, because 78538056129 - 2¹⁹ = 78537531841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78538056929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 386712 + ... + 553734.

It is an arithmetic number, because the mean of its divisors is an integer number (5091726640).

Almost surely, 2^78538056129 is an apocalyptic number.

It is an amenable number.

78538056129 is a deficient number, since it is larger than the sum of its proper divisors (43663383231).

78538056129 is a wasteful number, since it uses less digits than its factorization.

78538056129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171061 (or 171058 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 78538056129 in words is "seventy-eight billion, five hundred thirty-eight million, fifty-six thousand, one hundred twenty-nine".