8015799961 has 27 divisors (see below), whose sum is σ = 8895500253. Its totient is φ = 7219779840.

The previous prime is 8015799937. The next prime is 8015800027. The reversal of 8015799961 is 1699975108.

The square root of 8015799961 is 89531.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1464516361 + 6551283600 = 38269^2 + 80940^2 .

It is not a de Polignac number, because 8015799961 - 2⁵ = 8015799929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8015799901) 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, 82637065 + ... + 82637161.

Almost surely, 2^8015799961 is an apocalyptic number.

8015799961 is the 89531-st square number.

8015799961 is the 44766-th centered octagonal number.

It is an amenable number.

8015799961 is a deficient number, since it is larger than the sum of its proper divisors (879700292).

8015799961 is an frugal number, since it uses more digits than its factorization.

8015799961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 55.

The cubic root of 8015799961 is about 2001.3157975652.

The spelling of 8015799961 in words is "eight billion, fifteen million, seven hundred ninety-nine thousand, nine hundred sixty-one".