640761826576 has 45 divisors (see below), whose sum is σ = 1247554195909. Its totient is φ = 318819985088.

The previous prime is 640761826547. The next prime is 640761826577. The reversal of 640761826576 is 675628167046.

The square root of 640761826576 is 800476.

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

It can be written as a sum of positive squares in only one way, i.e., 606249104400 + 34512722176 = 778620^2 + 185776^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640761826576.

It is not an unprimeable number, because it can be changed into a prime (640761826577) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 938157531 + ... + 938158213.

Almost surely, 2^640761826576 is an apocalyptic number.

640761826576 is the 800476-th square number.

It is an amenable number.

640761826576 is a deficient number, since it is larger than the sum of its proper divisors (606792369333).

640761826576 is an frugal number, since it uses more digits than its factorization.

640761826576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 640761826576 in words is "six hundred forty billion, seven hundred sixty-one million, eight hundred twenty-six thousand, five hundred seventy-six".