668311232646 has 32 divisors (see below), whose sum is σ = 1352987919360. Its totient is φ = 220043873504.

The previous prime is 668311232623. The next prime is 668311232671. The reversal of 668311232646 is 646232113866.

It is a super-2 number, since 2×668311232646² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 668311232595 and 668311232604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2501836 + ... + 2756048.

It is an arithmetic number, because the mean of its divisors is an integer number (42280872480).

Almost surely, 2^668311232646 is an apocalyptic number.

668311232646 is an abundant number, since it is smaller than the sum of its proper divisors (684676686714).

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

668311232646 is a wasteful number, since it uses less digits than its factorization.

668311232646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259580.

The product of its digits is 1492992, while the sum is 48.

The spelling of 668311232646 in words is "six hundred sixty-eight billion, three hundred eleven million, two hundred thirty-two thousand, six hundred forty-six".