646040520566 has 32 divisors (see below), whose sum is σ = 1126726337280. Its totient is φ = 272076084000.

The previous prime is 646040520527. The next prime is 646040520581. The reversal of 646040520566 is 665025040646.

It is a happy number.

It is a congruent number.

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, 537665 + ... + 1257443.

It is an arithmetic number, because the mean of its divisors is an integer number (35210198040).

Almost surely, 2^646040520566 is an apocalyptic number.

646040520566 is a deficient number, since it is larger than the sum of its proper divisors (480685816714).

646040520566 is a wasteful number, since it uses less digits than its factorization.

646040520566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720900.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 646040520566 in words is "six hundred forty-six billion, forty million, five hundred twenty thousand, five hundred sixty-six".