679599918855 has 432 divisors, whose sum is σ = 1540471776480. Its totient is φ = 286087127040.

The previous prime is 679599918841. The next prime is 679599918859. The reversal of 679599918855 is 558819995976.

679599918855 is a `hidden beast` number, since 6 + 7 + 9 + 599 + 9 + 18 + 8 + 5 + 5 = 666.

It is not a de Polignac number, because 679599918855 - 2⁶ = 679599918791 is a prime.

It is a super-2 number, since 2×679599918855² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679599918859) by changing a digit.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 422373291 + ... + 422374899.

It is an arithmetic number, because the mean of its divisors is an integer number (3565906890).

Almost surely, 2^679599918855 is an apocalyptic number.

679599918855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

679599918855 is an abundant number, since it is smaller than the sum of its proper divisors (860871857625).

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

679599918855 is a wasteful number, since it uses less digits than its factorization.

679599918855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694 (or 1658 counting only the distinct ones).

The product of its digits is 2204496000, while the sum is 81.

The spelling of 679599918855 in words is "six hundred seventy-nine billion, five hundred ninety-nine million, nine hundred eighteen thousand, eight hundred fifty-five".