79856859393 has 16 divisors (see below), whose sum is σ = 119767035200. Its totient is φ = 53237904804.

The previous prime is 79856859373. The next prime is 79856859409. The reversal of 79856859393 is 39395865897.

79856859393 is a `hidden beast` number, since 7 + 9 + 8 + 568 + 59 + 3 + 9 + 3 = 666.

It is not a de Polignac number, because 79856859393 - 2⁵ = 79856859361 is a prime.

It is a super-2 number, since 2×79856859393² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79856859373) 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 15 ways as a sum of consecutive naturals, for example, 18254983 + ... + 18259356.

It is an arithmetic number, because the mean of its divisors is an integer number (7485439700).

Almost surely, 2^79856859393 is an apocalyptic number.

It is an amenable number.

79856859393 is a deficient number, since it is larger than the sum of its proper divisors (39910175807).

79856859393 is an frugal number, since it uses more digits than its factorization.

79856859393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36514360 (or 36514342 counting only the distinct ones).

The product of its digits is 440899200, while the sum is 72.

The spelling of 79856859393 in words is "seventy-nine billion, eight hundred fifty-six million, eight hundred fifty-nine thousand, three hundred ninety-three".