165396951815 has 4 divisors (see below), whose sum is σ = 198476342184. Its totient is φ = 132317561448.

The previous prime is 165396951787. The next prime is 165396951821. The reversal of 165396951815 is 518159693561.

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

It is a cyclic number.

It is not a de Polignac number, because 165396951815 - 2⁶ = 165396951751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 16539695177 + ... + 16539695186.

It is an arithmetic number, because the mean of its divisors is an integer number (49619085546).

Almost surely, 2^165396951815 is an apocalyptic number.

165396951815 is a deficient number, since it is larger than the sum of its proper divisors (33079390369).

165396951815 is an equidigital number, since it uses as much as digits as its factorization.

165396951815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33079390368.

The product of its digits is 8748000, while the sum is 59.

The spelling of 165396951815 in words is "one hundred sixty-five billion, three hundred ninety-six million, nine hundred fifty-one thousand, eight hundred fifteen".