640143212464 has 80 divisors (see below), whose sum is σ = 1460989633536. Its totient is φ = 266048697600.

The previous prime is 640143212431. The next prime is 640143212539. The reversal of 640143212464 is 464212341046.

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, 174772 + ... + 1144915.

Almost surely, 2^640143212464 is an apocalyptic number.

It is an amenable number.

640143212464 is an abundant number, since it is smaller than the sum of its proper divisors (820846421072).

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

640143212464 is a wasteful number, since it uses less digits than its factorization.

640143212464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319834 (or 1319828 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 640143212464 in words is "six hundred forty billion, one hundred forty-three million, two hundred twelve thousand, four hundred sixty-four".