6664837525 has 12 divisors (see below), whose sum is σ = 8266478724. Its totient is φ = 5330528000.

The previous prime is 6664837493. The next prime is 6664837561. The reversal of 6664837525 is 5257384666.

It can be written as a sum of positive squares in 6 ways, for example, as 1566734724 + 5098102801 = 39582^2 + 71401^2 .

It is not a de Polignac number, because 6664837525 - 2⁵ = 6664837493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74595 + ... + 137455.

It is an arithmetic number, because the mean of its divisors is an integer number (688873227).

Almost surely, 2^6664837525 is an apocalyptic number.

It is an amenable number.

6664837525 is a deficient number, since it is larger than the sum of its proper divisors (1601641199).

6664837525 is a wasteful number, since it uses less digits than its factorization.

6664837525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67112 (or 67107 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 52.

The square root of 6664837525 is about 81638.4561649717. The cubic root of 6664837525 is about 1881.8999131962.

The spelling of 6664837525 in words is "six billion, six hundred sixty-four million, eight hundred thirty-seven thousand, five hundred twenty-five".