65644425 has 120 divisors (see below), whose sum is σ = 151960512. Its totient is φ = 27216000.

The previous prime is 65644417. The next prime is 65644427. The reversal of 65644425 is 52444656.

65644425 is a `hidden beast` number, since 6 + 5 + 644 + 4 + 2 + 5 = 666.

It is not a de Polignac number, because 65644425 - 2³ = 65644417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65644425.

It is not an unprimeable number, because it can be changed into a prime (65644427) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 155715 + ... + 156135.

Almost surely, 2^65644425 is an apocalyptic number.

It is an amenable number.

65644425 is an abundant number, since it is smaller than the sum of its proper divisors (86316087).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65644425 is a wasteful number, since it uses less digits than its factorization.

65644425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 447 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 65644425 is about 8102.1247213308. The cubic root of 65644425 is about 403.3969554867.

The spelling of 65644425 in words is "sixty-five million, six hundred forty-four thousand, four hundred twenty-five".