668935514751 has 24 divisors (see below), whose sum is σ = 1044495975600. Its totient is φ = 379683424512.

The previous prime is 668935514747. The next prime is 668935514803. The reversal of 668935514751 is 157415539866.

It is a happy number.

It is not a de Polignac number, because 668935514751 - 2² = 668935514747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668935514551) 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, 15248506 + ... + 15292311.

It is an arithmetic number, because the mean of its divisors is an integer number (43520665650).

Almost surely, 2^668935514751 is an apocalyptic number.

668935514751 is a deficient number, since it is larger than the sum of its proper divisors (375560460849).

668935514751 is a wasteful number, since it uses less digits than its factorization.

668935514751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30540983 (or 30540976 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 60.

The spelling of 668935514751 in words is "six hundred sixty-eight billion, nine hundred thirty-five million, five hundred fourteen thousand, seven hundred fifty-one".