668337651557 has 16 divisors (see below), whose sum is σ = 683854254720. Its totient is φ = 652930200000.

The previous prime is 668337651547. The next prime is 668337651607. The reversal of 668337651557 is 755156733866.

It is a cyclic number.

It is not a de Polignac number, because 668337651557 - 2¹⁸ = 668337389413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668337651557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668337651547) 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, 87144119 + ... + 87151787.

It is an arithmetic number, because the mean of its divisors is an integer number (42740890920).

Almost surely, 2^668337651557 is an apocalyptic number.

It is an amenable number.

668337651557 is a deficient number, since it is larger than the sum of its proper divisors (15516603163).

668337651557 is a wasteful number, since it uses less digits than its factorization.

668337651557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14524.

The product of its digits is 95256000, while the sum is 62.

The spelling of 668337651557 in words is "six hundred sixty-eight billion, three hundred thirty-seven million, six hundred fifty-one thousand, five hundred fifty-seven".