668265543365 has 16 divisors (see below), whose sum is σ = 970388957952. Its totient is φ = 431283980544.

The previous prime is 668265543343. The next prime is 668265543371. The reversal of 668265543365 is 563345562866.

It is a cyclic number.

It is not a de Polignac number, because 668265543365 - 2⁸ = 668265543109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561567089 + ... + 561568278.

It is an arithmetic number, because the mean of its divisors is an integer number (60649309872).

Almost surely, 2^668265543365 is an apocalyptic number.

It is an amenable number.

668265543365 is a deficient number, since it is larger than the sum of its proper divisors (302123414587).

668265543365 is a wasteful number, since it uses less digits than its factorization.

668265543365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123135396.

The product of its digits is 93312000, while the sum is 59.

The spelling of 668265543365 in words is "six hundred sixty-eight billion, two hundred sixty-five million, five hundred forty-three thousand, three hundred sixty-five".