640311215466 has 64 divisors (see below), whose sum is σ = 1389321658368. Its totient is φ = 195568267968.

The previous prime is 640311215437. The next prime is 640311215477. The reversal of 640311215466 is 664512113046.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5982675 + ... + 6088761.

It is an arithmetic number, because the mean of its divisors is an integer number (21708150912).

Almost surely, 2^640311215466 is an apocalyptic number.

640311215466 is an abundant number, since it is smaller than the sum of its proper divisors (749010442902).

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

640311215466 is a wasteful number, since it uses less digits than its factorization.

640311215466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106675.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 640311215466 in words is "six hundred forty billion, three hundred eleven million, two hundred fifteen thousand, four hundred sixty-six".