66425395 has 4 divisors (see below), whose sum is σ = 79710480. Its totient is φ = 53140312.

The previous prime is 66425369. The next prime is 66425413. The reversal of 66425395 is 59352466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66425395 - 2⁷ = 66425267 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6642535 + ... + 6642544.

It is an arithmetic number, because the mean of its divisors is an integer number (19927620).

Almost surely, 2^66425395 is an apocalyptic number.

66425395 is a deficient number, since it is larger than the sum of its proper divisors (13285085).

66425395 is a wasteful number, since it uses less digits than its factorization.

66425395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13285084.

The product of its digits is 194400, while the sum is 40.

The square root of 66425395 is about 8150.1776054268. The cubic root of 66425395 is about 404.9903874160.

The spelling of 66425395 in words is "sixty-six million, four hundred twenty-five thousand, three hundred ninety-five".