17564468979 has 4 divisors (see below), whose sum is σ = 23419291976. Its totient is φ = 11709645984.

The previous prime is 17564468959. The next prime is 17564468981. The reversal of 17564468979 is 97986446571.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 17564468979 - 2²⁸ = 17296033523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17564468959) 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, 2927411494 + ... + 2927411499.

It is an arithmetic number, because the mean of its divisors is an integer number (5854822994).

Almost surely, 2^17564468979 is an apocalyptic number.

17564468979 is a deficient number, since it is larger than the sum of its proper divisors (5854822997).

17564468979 is an equidigital number, since it uses as much as digits as its factorization.

17564468979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5854822996.

The product of its digits is 91445760, while the sum is 66.

The spelling of 17564468979 in words is "seventeen billion, five hundred sixty-four million, four hundred sixty-eight thousand, nine hundred seventy-nine".