165515813479 has 2 divisors, whose sum is σ = 165515813480. Its totient is φ = 165515813478.

The previous prime is 165515813467. The next prime is 165515813497. The reversal of 165515813479 is 974318515561.

Together with next prime (165515813497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165515813479 - 2¹⁵ = 165515780711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165515813429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82757906739 + 82757906740.

It is an arithmetic number, because the mean of its divisors is an integer number (82757906740).

Almost surely, 2^165515813479 is an apocalyptic number.

165515813479 is a deficient number, since it is larger than the sum of its proper divisors (1).

165515813479 is an equidigital number, since it uses as much as digits as its factorization.

165515813479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536000, while the sum is 55.

The spelling of 165515813479 in words is "one hundred sixty-five billion, five hundred fifteen million, eight hundred thirteen thousand, four hundred seventy-nine".