165115665 has 80 divisors (see below), whose sum is σ = 347852736. Its totient is φ = 73872000.

The previous prime is 165115661. The next prime is 165115711. The reversal of 165115665 is 566511561.

It is not a de Polignac number, because 165115665 - 2² = 165115661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165115661) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 56490 + ... + 59340.

Almost surely, 2^165115665 is an apocalyptic number.

165115665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165115665 is an abundant number, since it is smaller than the sum of its proper divisors (182737071).

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

165115665 is a wasteful number, since it uses less digits than its factorization.

165115665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892 (or 2883 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 165115665 is about 12849.7340439404. The cubic root of 165115665 is about 548.6087869543.

The spelling of 165115665 in words is "one hundred sixty-five million, one hundred fifteen thousand, six hundred sixty-five".