165515810478 has 32 divisors (see below), whose sum is σ = 346133730816. Its totient is φ = 52664771808.

The previous prime is 165515810381. The next prime is 165515810479. The reversal of 165515810478 is 874018515561.

It is a self number, because there is not a number n which added to its sum of digits gives 165515810478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165515810479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1164201 + ... + 1298612.

It is an arithmetic number, because the mean of its divisors is an integer number (10816679088).

Almost surely, 2^165515810478 is an apocalyptic number.

165515810478 is an abundant number, since it is smaller than the sum of its proper divisors (180617920338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165515810478 is a wasteful number, since it uses less digits than its factorization.

165515810478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463328.

The product of its (nonzero) digits is 1344000, while the sum is 51.

The spelling of 165515810478 in words is "one hundred sixty-five billion, five hundred fifteen million, eight hundred ten thousand, four hundred seventy-eight".