15798863809 has 4 divisors (see below), whose sum is σ = 15809753520. Its totient is φ = 15787974100.

The previous prime is 15798863797. The next prime is 15798863819. The reversal of 15798863809 is 90836889751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90836889751 = 227743 ⋅398857.

It is a cyclic number.

It is not a de Polignac number, because 15798863809 - 2⁷ = 15798863681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15798863819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5442679 + ... + 5445580.

It is an arithmetic number, because the mean of its divisors is an integer number (3952438380).

Almost surely, 2^15798863809 is an apocalyptic number.

It is an amenable number.

15798863809 is a deficient number, since it is larger than the sum of its proper divisors (10889711).

15798863809 is a wasteful number, since it uses less digits than its factorization.

15798863809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10889710.

The product of its (nonzero) digits is 26127360, while the sum is 64.

The spelling of 15798863809 in words is "fifteen billion, seven hundred ninety-eight million, eight hundred sixty-three thousand, eight hundred nine".