6666666564 has 48 divisors (see below), whose sum is σ = 16238896128. Its totient is φ = 2124685728.

The previous prime is 6666666557. The next prime is 6666666571. The reversal of 6666666564 is 4656666666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6666666557) and next prime (6666666571).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953409 + ... + 960375.

It is an arithmetic number, because the mean of its divisors is an integer number (338310336).

Almost surely, 2^6666666564 is an apocalyptic number.

It is an amenable number.

6666666564 is an abundant number, since it is smaller than the sum of its proper divisors (9572229564).

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

6666666564 is a wasteful number, since it uses less digits than its factorization.

6666666564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10464 (or 10462 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 57.

The square root of 6666666564 is about 81649.6574640702. The cubic root of 6666666564 is about 1882.0720481008.

The spelling of 6666666564 in words is "six billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred sixty-four".