66415265 has 16 divisors (see below), whose sum is σ = 91601280. Its totient is φ = 45283200.

The previous prime is 66415253. The next prime is 66415273. The reversal of 66415265 is 56251466.

It is not a de Polignac number, because 66415265 - 2²⁰ = 65366689 is a prime.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965 + ... + 11565.

It is an arithmetic number, because the mean of its divisors is an integer number (5725080).

Almost surely, 2^66415265 is an apocalyptic number.

It is an amenable number.

66415265 is a deficient number, since it is larger than the sum of its proper divisors (25186015).

66415265 is a wasteful number, since it uses less digits than its factorization.

66415265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10792.

The product of its digits is 43200, while the sum is 35.

The square root of 66415265 is about 8149.5561228818. The cubic root of 66415265 is about 404.9697990994.

The spelling of 66415265 in words is "sixty-six million, four hundred fifteen thousand, two hundred sixty-five".