647665325 has 12 divisors (see below), whose sum is σ = 803425140. Its totient is φ = 517925760.

The previous prime is 647665309. The next prime is 647665363. The reversal of 647665325 is 523566746.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 12524521 + 635140804 = 3539^2 + 25202^2 .

It is not a de Polignac number, because 647665325 - 2⁴ = 647665309 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

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, 104411 + ... + 110439.

It is an arithmetic number, because the mean of its divisors is an integer number (66952095).

Almost surely, 2^647665325 is an apocalyptic number.

It is an amenable number.

647665325 is a deficient number, since it is larger than the sum of its proper divisors (155759815).

647665325 is a wasteful number, since it uses less digits than its factorization.

647665325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10336 (or 10331 counting only the distinct ones).

The product of its digits is 907200, while the sum is 44.

The square root of 647665325 is about 25449.2696358854. The cubic root of 647665325 is about 865.2007397163.

The spelling of 647665325 in words is "six hundred forty-seven million, six hundred sixty-five thousand, three hundred twenty-five".