165120615 has 48 divisors (see below), whose sum is σ = 316068480. Its totient is φ = 79074240.

The previous prime is 165120607. The next prime is 165120619. The reversal of 165120615 is 516021561.

It is a happy number.

165120615 is a `hidden beast` number, since 1 + 651 + 2 + 0 + 6 + 1 + 5 = 666.

It is not a de Polignac number, because 165120615 - 2³ = 165120607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165120619) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39076 + ... + 43094.

It is an arithmetic number, because the mean of its divisors is an integer number (6584760).

Almost surely, 2^165120615 is an apocalyptic number.

165120615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165120615 is a deficient number, since it is larger than the sum of its proper divisors (150947865).

165120615 is a wasteful number, since it uses less digits than its factorization.

165120615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124 (or 4121 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 165120615 is about 12849.9266534872. The cubic root of 165120615 is about 548.6142691443.

The spelling of 165120615 in words is "one hundred sixty-five million, one hundred twenty thousand, six hundred fifteen".