640622146566 has 32 divisors (see below), whose sum is σ = 1289504387808. Its totient is φ = 212164243200.

The previous prime is 640622146537. The next prime is 640622146603. The reversal of 640622146566 is 665641226046.

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, 22406256 + ... + 22434828.

It is an arithmetic number, because the mean of its divisors is an integer number (40297012119).

Almost surely, 2^640622146566 is an apocalyptic number.

640622146566 is an abundant number, since it is smaller than the sum of its proper divisors (648882241242).

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

640622146566 is a wasteful number, since it uses less digits than its factorization.

640622146566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52536.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 640622146566 in words is "six hundred forty billion, six hundred twenty-two million, one hundred forty-six thousand, five hundred sixty-six".