668320825431 has 96 divisors (see below), whose sum is σ = 1061917828608. Its totient is φ = 373776923520.

The previous prime is 668320825429. The next prime is 668320825433. The reversal of 668320825431 is 134528023866.

It is an interprime number because it is at equal distance from previous prime (668320825429) and next prime (668320825433).

It is not a de Polignac number, because 668320825431 - 2¹ = 668320825429 is a prime.

It is a super-2 number, since 2×668320825431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668320825433) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 611454921 + ... + 611456013.

It is an arithmetic number, because the mean of its divisors is an integer number (11061644048).

Almost surely, 2^668320825431 is an apocalyptic number.

668320825431 is a deficient number, since it is larger than the sum of its proper divisors (393597003177).

668320825431 is an equidigital number, since it uses as much as digits as its factorization.

668320825431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 668320825431 in words is "six hundred sixty-eight billion, three hundred twenty million, eight hundred twenty-five thousand, four hundred thirty-one".