3966163859529 has 27 divisors (see below), whose sum is σ = 6046467177933. Its totient is φ = 2504873900664.

The previous prime is 3966163859509. The next prime is 3966163859629. The reversal of 3966163859529 is 9259583616693.

The square root of 3966163859529 is 1991523.

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

3966163859529 is a `hidden beast` number, since 3 + 9 + 6 + 6 + 1 + 6 + 3 + 8 + 595 + 29 = 666.

It is not a de Polignac number, because 3966163859529 - 2²⁵ = 3966130305097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3966163859509) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 113499342 + ... + 113534280.

Almost surely, 2^{3966163859529} is an apocalyptic number.

3966163859529 is the 1991523-rd square number.

3966163859529 is the 995762-nd centered octagonal number.

It is an amenable number.

3966163859529 is a deficient number, since it is larger than the sum of its proper divisors (2080303318404).

3966163859529 is an frugal number, since it uses more digits than its factorization.

3966163859529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69922 (or 34961 counting only the distinct ones).

The product of its digits is 566870400, while the sum is 72.

The spelling of 3966163859529 in words is "three trillion, nine hundred sixty-six billion, one hundred sixty-three million, eight hundred fifty-nine thousand, five hundred twenty-nine".