39861860640625 has 63 divisors (see below), whose sum is σ = 50837897489239. Its totient is φ = 31254969200000.

The previous prime is 39861860640619. The next prime is 39861860640659. The reversal of 39861860640625 is 52604606816893.

The square root of 39861860640625 is 6313625.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 31 ways, for example, as 9315723395889 + 30546137244736 = 3052167^2 + 5526856^2 .

It is not a de Polignac number, because 39861860640625 - 2⁵ = 39861860640593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 41827765149 + ... + 41827766101.

Almost surely, 2^{39861860640625} is an apocalyptic number.

39861860640625 is the 6313625-th square number.

39861860640625 is the 3156813-rd centered octagonal number.

It is an amenable number.

39861860640625 is a deficient number, since it is larger than the sum of its proper divisors (10976036848614).

39861860640625 is an frugal number, since it uses more digits than its factorization.

39861860640625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 64.

The spelling of 39861860640625 in words is "thirty-nine trillion, eight hundred sixty-one billion, eight hundred sixty million, six hundred forty thousand, six hundred twenty-five".