79899139530 has 160 divisors (see below), whose sum is σ = 258454373760. Its totient is φ = 17301444480.

The previous prime is 79899139517. The next prime is 79899139531. The reversal of 79899139530 is 3593199897.

79899139530 is a `hidden beast` number, since 7 + 9 + 8 + 9 + 91 + 3 + 9 + 530 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (79899139531) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 263101 + ... + 478560.

It is an arithmetic number, because the mean of its divisors is an integer number (1615339836).

Almost surely, 2^79899139530 is an apocalyptic number.

79899139530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

79899139530 is an abundant number, since it is smaller than the sum of its proper divisors (178555234230).

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

79899139530 is a wasteful number, since it uses less digits than its factorization.

79899139530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741706 (or 741697 counting only the distinct ones).

The product of its (nonzero) digits is 16533720, while the sum is 63.

The spelling of 79899139530 in words is "seventy-nine billion, eight hundred ninety-nine million, one hundred thirty-nine thousand, five hundred thirty".