8156965538 has 6 divisors (see below), whose sum is σ = 12235639899. Its totient is φ = 4078418906.

The previous prime is 8156965511. The next prime is 8156965541. The reversal of 8156965538 is 8355696518.

It can be written as a sum of positive squares in only one way, i.e., 4078482769 + 4078482769 = 63863^2 + 63863^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=63863.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 95795 + ... + 159657.

Almost surely, 2^8156965538 is an apocalyptic number.

8156965538 is a deficient number, since it is larger than the sum of its proper divisors (4078674361).

8156965538 is an frugal number, since it uses more digits than its factorization.

8156965538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127728 (or 63865 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 56.

The square root of 8156965538 is about 90315.9207338330. The cubic root of 8156965538 is about 2012.9958327581.

The spelling of 8156965538 in words is "eight billion, one hundred fifty-six million, nine hundred sixty-five thousand, five hundred thirty-eight".