666656470136 has 8 divisors (see below), whose sum is σ = 1249980881520. Its totient is φ = 333328235064.

The previous prime is 666656470133. The next prime is 666656470153. The reversal of 666656470136 is 631074656666.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666656470133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41666029376 + ... + 41666029391.

It is an arithmetic number, because the mean of its divisors is an integer number (156247610190).

Almost surely, 2^666656470136 is an apocalyptic number.

It is an amenable number.

666656470136 is a deficient number, since it is larger than the sum of its proper divisors (583324411384).

666656470136 is a wasteful number, since it uses less digits than its factorization.

666656470136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83332058773 (or 83332058769 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 56.

The spelling of 666656470136 in words is "six hundred sixty-six billion, six hundred fifty-six million, four hundred seventy thousand, one hundred thirty-six".