15879948817 has 4 divisors (see below), whose sum is σ = 15887516400. Its totient is φ = 15872381236.

The previous prime is 15879948793. The next prime is 15879948853. The reversal of 15879948817 is 71884997851.

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.

It is a cyclic number.

It is not a de Polignac number, because 15879948817 - 2¹¹ = 15879946769 is a prime.

It is a super-4 number, since 4×15879948817⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15879948517) 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, 3780643 + ... + 3784840.

It is an arithmetic number, because the mean of its divisors is an integer number (3971879100).

Almost surely, 2^15879948817 is an apocalyptic number.

It is an amenable number.

15879948817 is a deficient number, since it is larger than the sum of its proper divisors (7567583).

15879948817 is an equidigital number, since it uses as much as digits as its factorization.

15879948817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7567582.

The product of its digits is 40642560, while the sum is 67.

The spelling of 15879948817 in words is "fifteen billion, eight hundred seventy-nine million, nine hundred forty-eight thousand, eight hundred seventeen".