65665572 has 24 divisors (see below), whose sum is σ = 175108416. Its totient is φ = 18761568.

The previous prime is 65665549. The next prime is 65665573. The reversal of 65665572 is 27556656.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (65665573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390783 + ... + 390950.

It is an arithmetic number, because the mean of its divisors is an integer number (7296184).

Almost surely, 2^65665572 is an apocalyptic number.

It is an amenable number.

65665572 is an abundant number, since it is smaller than the sum of its proper divisors (109442844).

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

65665572 is a wasteful number, since it uses less digits than its factorization.

65665572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781747 (or 781745 counting only the distinct ones).

The product of its digits is 378000, while the sum is 42.

The square root of 65665572 is about 8103.4296442926. The cubic root of 65665572 is about 403.4402682257.

The spelling of 65665572 in words is "sixty-five million, six hundred sixty-five thousand, five hundred seventy-two".