668935957929 has 16 divisors (see below), whose sum is σ = 926184646464. Its totient is φ = 429120288000.

The previous prime is 668935957919. The next prime is 668935957993. The reversal of 668935957929 is 929759539866.

It is not a de Polignac number, because 668935957929 - 2¹⁶ = 668935892393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668935957919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37241047 + ... + 37259004.

It is an arithmetic number, because the mean of its divisors is an integer number (57886540404).

Almost surely, 2^668935957929 is an apocalyptic number.

It is an amenable number.

668935957929 is a deficient number, since it is larger than the sum of its proper divisors (257248688535).

668935957929 is a wasteful number, since it uses less digits than its factorization.

668935957929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74500168.

The product of its digits is 1984046400, while the sum is 78.

The spelling of 668935957929 in words is "six hundred sixty-eight billion, nine hundred thirty-five million, nine hundred fifty-seven thousand, nine hundred twenty-nine".