165005261600 has 144 divisors (see below), whose sum is σ = 408209935392. Its totient is φ = 65120962560.

The previous prime is 165005261581. The next prime is 165005261623. The reversal of 165005261600 is 6162500561.

It is a Harshad number since it is a multiple of its sum of digits (32).

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 23 ways as a sum of consecutive naturals, for example, 79214159 + ... + 79216241.

It is an arithmetic number, because the mean of its divisors is an integer number (2834791218).

Almost surely, 2^165005261600 is an apocalyptic number.

165005261600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165005261600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204104967696).

165005261600 is an abundant number, since it is smaller than the sum of its proper divisors (243204673792).

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

165005261600 is a wasteful number, since it uses less digits than its factorization.

165005261600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379 (or 3366 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 165005261600 in words is "one hundred sixty-five billion, five million, two hundred sixty-one thousand, six hundred".