15585396979 has 2 divisors, whose sum is σ = 15585396980. Its totient is φ = 15585396978.

The previous prime is 15585396941. The next prime is 15585396991. The reversal of 15585396979 is 97969358551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15585396979 - 2²¹ = 15583299827 is a prime.

It is not a weakly prime, because it can be changed into another prime (15585396679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7792698489 + 7792698490.

It is an arithmetic number, because the mean of its divisors is an integer number (7792698490).

Almost surely, 2^15585396979 is an apocalyptic number.

15585396979 is a deficient number, since it is larger than the sum of its proper divisors (1).

15585396979 is an equidigital number, since it uses as much as digits as its factorization.

15585396979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854000, while the sum is 67.

The spelling of 15585396979 in words is "fifteen billion, five hundred eighty-five million, three hundred ninety-six thousand, nine hundred seventy-nine".