39645019825 has 12 divisors (see below), whose sum is σ = 49162416028. Its totient is φ = 31714344000.

The previous prime is 39645019793. The next prime is 39645019853. The reversal of 39645019825 is 52891054693.

It can be written as a sum of positive squares in 6 ways, for example, as 13432114609 + 26212905216 = 115897^2 + 161904^2 .

It is not a de Polignac number, because 39645019825 - 2⁵ = 39645019793 is a prime.

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, 700279 + ... + 754771.

Almost surely, 2^39645019825 is an apocalyptic number.

It is an amenable number.

39645019825 is a deficient number, since it is larger than the sum of its proper divisors (9517396203).

39645019825 is a wasteful number, since it uses less digits than its factorization.

39645019825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83604 (or 83599 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 39645019825 in words is "thirty-nine billion, six hundred forty-five million, nineteen thousand, eight hundred twenty-five".