165391415 has 12 divisors (see below), whose sum is σ = 230873256. Its totient is φ = 113411088.

The previous prime is 165391411. The next prime is 165391423. The reversal of 165391415 is 514193561.

It is not a de Polignac number, because 165391415 - 2² = 165391411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165391411) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 337289 + ... + 337778.

It is an arithmetic number, because the mean of its divisors is an integer number (19239438).

Almost surely, 2^165391415 is an apocalyptic number.

165391415 is a deficient number, since it is larger than the sum of its proper divisors (65481841).

165391415 is an equidigital number, since it uses as much as digits as its factorization.

165391415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675086 (or 675079 counting only the distinct ones).

The product of its digits is 16200, while the sum is 35.

The square root of 165391415 is about 12860.4593619357. The cubic root of 165391415 is about 548.9140169013.

The spelling of 165391415 in words is "one hundred sixty-five million, three hundred ninety-one thousand, four hundred fifteen".