679956438651 has 32 divisors (see below), whose sum is σ = 1060054414848. Its totient is φ = 379633512960.

The previous prime is 679956438649. The next prime is 679956438713. The reversal of 679956438651 is 156834659976.

It is not a de Polignac number, because 679956438651 - 2¹ = 679956438649 is a prime.

It is a super-2 number, since 2×679956438651² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (679956438751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 999241 + ... + 1535706.

It is an arithmetic number, because the mean of its divisors is an integer number (33126700464).

Almost surely, 2^679956438651 is an apocalyptic number.

679956438651 is a deficient number, since it is larger than the sum of its proper divisors (380097976197).

679956438651 is a wasteful number, since it uses less digits than its factorization.

679956438651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535251.

The product of its digits is 293932800, while the sum is 69.

The spelling of 679956438651 in words is "six hundred seventy-nine billion, nine hundred fifty-six million, four hundred thirty-eight thousand, six hundred fifty-one".