641453624464 has 15 divisors (see below), whose sum is σ = 1242822604467. Its totient is φ = 320725210416.

The previous prime is 641453624453. The next prime is 641453624467. The reversal of 641453624464 is 464426354146.

The square root of 641453624464 is 800908.

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

It is a super-2 number, since 2×641453624464² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641453624467) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3103519 + ... + 3303745.

Almost surely, 2^641453624464 is an apocalyptic number.

641453624464 is the 800908-th square number.

It is an amenable number.

641453624464 is a deficient number, since it is larger than the sum of its proper divisors (601368980003).

641453624464 is an frugal number, since it uses more digits than its factorization.

641453624464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400462 (or 200229 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 49.

Multiplying 641453624464 by its sum of digits (49), we get a square (31431227598736 = 5606356²).

The spelling of 641453624464 in words is "six hundred forty-one billion, four hundred fifty-three million, six hundred twenty-four thousand, four hundred sixty-four".