666210345564 has 12 divisors (see below), whose sum is σ = 1554490806344. Its totient is φ = 222070115184.

The previous prime is 666210345539. The next prime is 666210345583. The reversal of 666210345564 is 465543012666.

666210345564 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27758764387 + ... + 27758764410.

Almost surely, 2^666210345564 is an apocalyptic number.

It is an amenable number.

666210345564 is an abundant number, since it is smaller than the sum of its proper divisors (888280460780).

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

666210345564 is a wasteful number, since it uses less digits than its factorization.

666210345564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55517528804 (or 55517528802 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 666210345564 in words is "six hundred sixty-six billion, two hundred ten million, three hundred forty-five thousand, five hundred sixty-four".