668247407457 has 24 divisors (see below), whose sum is σ = 1036531755936. Its totient is φ = 381831202368.

The previous prime is 668247407447. The next prime is 668247407483. The reversal of 668247407457 is 754704742866.

It is not a de Polignac number, because 668247407457 - 2⁴ = 668247407441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668247407457.

It is not an unprimeable number, because it can be changed into a prime (668247407447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2295978 + ... + 2570604.

It is an arithmetic number, because the mean of its divisors is an integer number (43188823164).

Almost surely, 2^668247407457 is an apocalyptic number.

It is an amenable number.

668247407457 is a deficient number, since it is larger than the sum of its proper divisors (368284348479).

668247407457 is a wasteful number, since it uses less digits than its factorization.

668247407457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291197 (or 291190 counting only the distinct ones).

The product of its (nonzero) digits is 63221760, while the sum is 60.

The spelling of 668247407457 in words is "six hundred sixty-eight billion, two hundred forty-seven million, four hundred seven thousand, four hundred fifty-seven".