165021415 has 8 divisors (see below), whose sum is σ = 213258528. Its totient is φ = 121861920.

The previous prime is 165021377. The next prime is 165021421. The reversal of 165021415 is 514120561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-165021415 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165021415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1269331 + ... + 1269460.

It is an arithmetic number, because the mean of its divisors is an integer number (26657316).

Almost surely, 2^165021415 is an apocalyptic number.

165021415 is a deficient number, since it is larger than the sum of its proper divisors (48237113).

165021415 is a wasteful number, since it uses less digits than its factorization.

165021415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538809.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 165021415 is about 12846.0661293643. The cubic root of 165021415 is about 548.5043829304.

Adding to 165021415 its reverse (514120561), we get a palindrome (679141976).

The spelling of 165021415 in words is "one hundred sixty-five million, twenty-one thousand, four hundred fifteen".