165015225 has 72 divisors (see below), whose sum is σ = 320104512. Its totient is φ = 84110400.

The previous prime is 165015211. The next prime is 165015241. The reversal of 165015225 is 522510561.

165015225 is a `hidden beast` number, since 1 + 650 + 1 + 5 + 2 + 2 + 5 = 666.

It is not a de Polignac number, because 165015225 - 2⁹ = 165014713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 139135 + ... + 140315.

It is an arithmetic number, because the mean of its divisors is an integer number (4445896).

Almost surely, 2^165015225 is an apocalyptic number.

165015225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165015225 is a deficient number, since it is larger than the sum of its proper divisors (155089287).

165015225 is a wasteful number, since it uses less digits than its factorization.

165015225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1212 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 165015225 is about 12845.8251973161. The cubic root of 165015225 is about 548.4975246597.

Adding to 165015225 its reverse (522510561), we get a palindrome (687525786).

The spelling of 165015225 in words is "one hundred sixty-five million, fifteen thousand, two hundred twenty-five".