641973725 has 18 divisors (see below), whose sum is σ = 824373390. Its totient is φ = 495342400.

The previous prime is 641973713. The next prime is 641973751. The reversal of 641973725 is 527379146.

It can be written as a sum of positive squares in 9 ways, for example, as 97871449 + 544102276 = 9893^2 + 23326^2 .

It is a de Polignac number, because none of the positive numbers 2^k-641973725 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 681755 + ... + 682695.

Almost surely, 2^641973725 is an apocalyptic number.

It is an amenable number.

641973725 is a deficient number, since it is larger than the sum of its proper divisors (182399665).

641973725 is an frugal number, since it uses more digits than its factorization.

641973725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921 (or 975 counting only the distinct ones).

The product of its digits is 317520, while the sum is 44.

The square root of 641973725 is about 25337.2004175678. The cubic root of 641973725 is about 862.6588547284.

The spelling of 641973725 in words is "six hundred forty-one million, nine hundred seventy-three thousand, seven hundred twenty-five".