65664507 has 8 divisors (see below), whose sum is σ = 87650640. Its totient is φ = 43727360.

The previous prime is 65664491. The next prime is 65664553. The reversal of 65664507 is 70546656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65664507 - 2⁴ = 65664491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65664607) 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, 8994 + ... + 14567.

It is an arithmetic number, because the mean of its divisors is an integer number (10956330).

Almost surely, 2^65664507 is an apocalyptic number.

65664507 is a deficient number, since it is larger than the sum of its proper divisors (21986133).

65664507 is a wasteful number, since it uses less digits than its factorization.

65664507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24493.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 65664507 is about 8103.3639311091. The cubic root of 65664507 is about 403.4380871426.

The spelling of 65664507 in words is "sixty-five million, six hundred sixty-four thousand, five hundred seven".