15799579857 has 12 divisors (see below), whose sum is σ = 22822994740. Its totient is φ = 10532416608.

The previous prime is 15799579853. The next prime is 15799579889. The reversal of 15799579857 is 75897599751.

It can be written as a sum of positive squares in 2 ways, for example, as 1332542016 + 14467037841 = 36504^2 + 120279^2 .

It is not a de Polignac number, because 15799579857 - 2² = 15799579853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15799579853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141783 + ... + 227379.

Almost surely, 2^15799579857 is an apocalyptic number.

It is an amenable number.

15799579857 is a deficient number, since it is larger than the sum of its proper divisors (7023414883).

15799579857 is a wasteful number, since it uses less digits than its factorization.

15799579857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106112 (or 106109 counting only the distinct ones).

The product of its digits is 250047000, while the sum is 72.

The spelling of 15799579857 in words is "fifteen billion, seven hundred ninety-nine million, five hundred seventy-nine thousand, eight hundred fifty-seven".