53173665 has 20 divisors (see below), whose sum is σ = 95319444. Its totient is φ = 28359072.

The previous prime is 53173651. The next prime is 53173667. The reversal of 53173665 is 56637135.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 34433424 + 18740241 = 5868^2 + 4329^2 .

It is not a de Polignac number, because 53173665 - 2⁷ = 53173537 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (53173667) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 65242 + ... + 66051.

Almost surely, 2^53173665 is an apocalyptic number.

It is an amenable number.

53173665 is a deficient number, since it is larger than the sum of its proper divisors (42145779).

53173665 is a wasteful number, since it uses less digits than its factorization.

53173665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131310 (or 131301 counting only the distinct ones).

The product of its digits is 56700, while the sum is 36.

The square root of 53173665 is about 7292.0274958341. The cubic root of 53173665 is about 376.0384019364.

The spelling of 53173665 in words is "fifty-three million, one hundred seventy-three thousand, six hundred sixty-five".