668754686667 has 16 divisors (see below), whose sum is σ = 926061772320. Its totient is φ = 428912808192.

The previous prime is 668754686657. The next prime is 668754686693. The reversal of 668754686667 is 766686457866.

It is not a de Polignac number, because 668754686667 - 2²² = 668750492363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668754686657) 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, 33837408 + ... + 33857165.

It is an arithmetic number, because the mean of its divisors is an integer number (57878860770).

Almost surely, 2^668754686667 is an apocalyptic number.

668754686667 is a deficient number, since it is larger than the sum of its proper divisors (257307085653).

668754686667 is a wasteful number, since it uses less digits than its factorization.

668754686667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67694702.

The product of its digits is 2926264320, while the sum is 75.

The spelling of 668754686667 in words is "six hundred sixty-eight billion, seven hundred fifty-four million, six hundred eighty-six thousand, six hundred sixty-seven".