165517955279 has 4 divisors (see below), whose sum is σ = 165519158376. Its totient is φ = 165516752184.

The previous prime is 165517955263. The next prime is 165517955293. The reversal of 165517955279 is 972559715561.

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 165517955279 - 2⁴ = 165517955263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165517955579) 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, 363884 + ... + 680769.

It is an arithmetic number, because the mean of its divisors is an integer number (41379789594).

Almost surely, 2^165517955279 is an apocalyptic number.

165517955279 is a deficient number, since it is larger than the sum of its proper divisors (1203097).

165517955279 is a wasteful number, since it uses less digits than its factorization.

165517955279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203096.

The product of its digits is 29767500, while the sum is 62.

The spelling of 165517955279 in words is "one hundred sixty-five billion, five hundred seventeen million, nine hundred fifty-five thousand, two hundred seventy-nine".