666610711664 has 40 divisors (see below), whose sum is σ = 1333296413568. Its totient is φ = 322535427840.

The previous prime is 666610711649. The next prime is 666610711667. The reversal of 666610711664 is 466117016666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666610711667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14160614 + ... + 14207610.

Almost surely, 2^666610711664 is an apocalyptic number.

It is an amenable number.

666610711664 is an abundant number, since it is smaller than the sum of its proper divisors (666685701904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666610711664 is a wasteful number, since it uses less digits than its factorization.

666610711664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75633 (or 75627 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 666610711664 in words is "six hundred sixty-six billion, six hundred ten million, seven hundred eleven thousand, six hundred sixty-four".