66661010564 has 24 divisors (see below), whose sum is σ = 117345043200. Its totient is φ = 33134300640.

The previous prime is 66661010543. The next prime is 66661010609. The reversal of 66661010564 is 46501016666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548429 + ... + 658859.

It is an arithmetic number, because the mean of its divisors is an integer number (4889376800).

Almost surely, 2^66661010564 is an apocalyptic number.

It is an amenable number.

66661010564 is a deficient number, since it is larger than the sum of its proper divisors (50684032636).

66661010564 is a wasteful number, since it uses less digits than its factorization.

66661010564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111323 (or 111321 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 66661010564 in words is "sixty-six billion, six hundred sixty-one million, ten thousand, five hundred sixty-four".