6649739425 has 12 divisors (see below), whose sum is σ = 9423630976. Its totient is φ = 4559821200.

The previous prime is 6649739407. The next prime is 6649739471. The reversal of 6649739425 is 5249379466.

It is not a de Polignac number, because 6649739425 - 2²¹ = 6647642273 is a prime.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian 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, 18999081 + ... + 18999430.

Almost surely, 2^6649739425 is an apocalyptic number.

It is an amenable number.

6649739425 is a deficient number, since it is larger than the sum of its proper divisors (2773891551).

6649739425 is a wasteful number, since it uses less digits than its factorization.

6649739425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37998528 (or 37998523 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 55.

The square root of 6649739425 is about 81545.9344480152. The cubic root of 6649739425 is about 1880.4777932469.

The spelling of 6649739425 in words is "six billion, six hundred forty-nine million, seven hundred thirty-nine thousand, four hundred twenty-five".