66644462402 has 16 divisors (see below), whose sum is σ = 114279944640. Its totient is φ = 28553838768.

The previous prime is 66644462371. The next prime is 66644462447. The reversal of 66644462402 is 20426444666.

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, 621377 + ... + 720692.

It is an arithmetic number, because the mean of its divisors is an integer number (7142496540).

Almost surely, 2^66644462402 is an apocalyptic number.

66644462402 is a deficient number, since it is larger than the sum of its proper divisors (47635482238).

66644462402 is a wasteful number, since it uses less digits than its factorization.

66644462402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345625.

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 66644462402 in words is "sixty-six billion, six hundred forty-four million, four hundred sixty-two thousand, four hundred two".