640450466504 has 8 divisors (see below), whose sum is σ = 1200844624710. Its totient is φ = 320225233248.

The previous prime is 640450466489. The next prime is 640450466543. The reversal of 640450466504 is 405664054046.

It can be written as a sum of positive squares in only one way, i.e., 581250710404 + 59199756100 = 762398^2 + 243310^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40028154149 + ... + 40028154164.

Almost surely, 2^640450466504 is an apocalyptic number.

It is an amenable number.

640450466504 is a deficient number, since it is larger than the sum of its proper divisors (560394158206).

640450466504 is a wasteful number, since it uses less digits than its factorization.

640450466504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80056308319 (or 80056308315 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 640450466504 in words is "six hundred forty billion, four hundred fifty million, four hundred sixty-six thousand, five hundred four".