165151999272 has 128 divisors (see below), whose sum is σ = 468346435200. Its totient is φ = 48110174208.

The previous prime is 165151999247. The next prime is 165151999339. The reversal of 165151999272 is 272999151561.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10051608 + ... + 10068024.

It is an arithmetic number, because the mean of its divisors is an integer number (3658956525).

Almost surely, 2^165151999272 is an apocalyptic number.

165151999272 is a gapful number since it is divisible by the number (12) 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 165151999272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234173217600).

165151999272 is an abundant number, since it is smaller than the sum of its proper divisors (303194435928).

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

165151999272 is a wasteful number, since it uses less digits than its factorization.

165151999272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18155 (or 18151 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 57.

The spelling of 165151999272 in words is "one hundred sixty-five billion, one hundred fifty-one million, nine hundred ninety-nine thousand, two hundred seventy-two".