15579971579323 has 4 divisors (see below), whose sum is σ = 16117211978640. Its totient is φ = 15042731180008.

The previous prime is 15579971579309. The next prime is 15579971579441. The reversal of 15579971579323 is 32397517997551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15579971579323 is a prime.

It is a super-2 number, since 2×15579971579323² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15579971579023) 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, 268620199615 + ... + 268620199672.

It is an arithmetic number, because the mean of its divisors is an integer number (4029302994660).

Almost surely, 2^{15579971579323} is an apocalyptic number.

15579971579323 is a deficient number, since it is larger than the sum of its proper divisors (537240399317).

15579971579323 is an equidigital number, since it uses as much as digits as its factorization.

15579971579323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537240399316.

The product of its digits is 562605750, while the sum is 73.

The spelling of 15579971579323 in words is "fifteen trillion, five hundred seventy-nine billion, nine hundred seventy-one million, five hundred seventy-nine thousand, three hundred twenty-three".