165515810380 has 24 divisors (see below), whose sum is σ = 368029273248. Its totient is φ = 62311834368.

The previous prime is 165515810351. The next prime is 165515810381. The reversal of 165515810380 is 83018515561.

It is not an unprimeable number, because it can be changed into a prime (165515810381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243405264 + ... + 243405943.

It is an arithmetic number, because the mean of its divisors is an integer number (15334553052).

Almost surely, 2^165515810380 is an apocalyptic number.

165515810380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165515810380 is an abundant number, since it is smaller than the sum of its proper divisors (202513462868).

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

165515810380 is a wasteful number, since it uses less digits than its factorization.

165515810380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486811233 (or 486811231 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 43.

The spelling of 165515810380 in words is "one hundred sixty-five billion, five hundred fifteen million, eight hundred ten thousand, three hundred eighty".