79866820131 has 48 divisors (see below), whose sum is σ = 136086370560. Its totient is φ = 40692810240.

The previous prime is 79866820081. The next prime is 79866820139. The reversal of 79866820131 is 13102866897.

It is not a de Polignac number, because 79866820131 - 2¹⁰ = 79866819107 is a prime.

It is a super-2 number, since 2×79866820131² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (79866820139) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 231000 + ... + 461621.

It is an arithmetic number, because the mean of its divisors is an integer number (2835132720).

Almost surely, 2^79866820131 is an apocalyptic number.

79866820131 is a deficient number, since it is larger than the sum of its proper divisors (56219550429).

79866820131 is a wasteful number, since it uses less digits than its factorization.

79866820131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692684 (or 692667 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 79866820131 in words is "seventy-nine billion, eight hundred sixty-six million, eight hundred twenty thousand, one hundred thirty-one".