128165851215 has 24 divisors (see below), whose sum is σ = 222178001760. Its totient is φ = 68347779264.

The previous prime is 128165851193. The next prime is 128165851241. The reversal of 128165851215 is 512158561821.

128165851215 is a `hidden beast` number, since 1 + 2 + 81 + 6 + 58 + 512 + 1 + 5 = 666.

It is not a de Polignac number, because 128165851215 - 2²⁵ = 128132296783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284446 + ... + 580724.

It is an arithmetic number, because the mean of its divisors is an integer number (9257416740).

Almost surely, 2^128165851215 is an apocalyptic number.

128165851215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128165851215 is a deficient number, since it is larger than the sum of its proper divisors (94012150545).

128165851215 is a wasteful number, since it uses less digits than its factorization.

128165851215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305903 (or 305900 counting only the distinct ones).

The product of its digits is 192000, while the sum is 45.

The spelling of 128165851215 in words is "one hundred twenty-eight billion, one hundred sixty-five million, eight hundred fifty-one thousand, two hundred fifteen".