39664734225 has 24 divisors (see below), whose sum is σ = 65589313920. Its totient is φ = 21151206720.

The previous prime is 39664734217. The next prime is 39664734227. The reversal of 39664734225 is 52243746693.

It is not a de Polignac number, because 39664734225 - 2³ = 39664734217 is a prime.

It is a super-2 number, since 2×39664734225² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39664734227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483927 + ... + 559923.

It is an arithmetic number, because the mean of its divisors is an integer number (2732888080).

Almost surely, 2^39664734225 is an apocalyptic number.

It is an amenable number.

39664734225 is a deficient number, since it is larger than the sum of its proper divisors (25924579695).

39664734225 is a wasteful number, since it uses less digits than its factorization.

39664734225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82969 (or 82964 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 51.

The spelling of 39664734225 in words is "thirty-nine billion, six hundred sixty-four million, seven hundred thirty-four thousand, two hundred twenty-five".