640358309311204 has 81 divisors (see below), whose sum is σ = 1300026832678371. Its totient is φ = 275747827045680.

The previous prime is 640358309311159. The next prime is 640358309311207. The reversal of 640358309311204 is 402113903853046.

The square root of 640358309311204 is 25305302.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (640358309311207) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10577585967 + ... + 10577646505.

Almost surely, 2^{640358309311204} is an apocalyptic number.

640358309311204 is the 25305302-nd square number.

It is an amenable number.

640358309311204 is an abundant number, since it is smaller than the sum of its proper divisors (659668523367167).

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

640358309311204 is an frugal number, since it uses more digits than its factorization.

640358309311204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121142 (or 60571 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 640358309311204 in words is "six hundred forty trillion, three hundred fifty-eight billion, three hundred nine million, three hundred eleven thousand, two hundred four".