65664007 has 4 divisors (see below), whose sum is σ = 65843296. Its totient is φ = 65484720.

The previous prime is 65663993. The next prime is 65664037. The reversal of 65664007 is 70046656.

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 65664007 - 2⁷ = 65663879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65664037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89094 + ... + 89827.

It is an arithmetic number, because the mean of its divisors is an integer number (16460824).

Almost surely, 2^65664007 is an apocalyptic number.

65664007 is a deficient number, since it is larger than the sum of its proper divisors (179289).

65664007 is a wasteful number, since it uses less digits than its factorization.

65664007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179288.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 65664007 is about 8103.3330796654. Note that the first 3 decimals coincide. The cubic root of 65664007 is about 403.4370631518.

The spelling of 65664007 in words is "sixty-five million, six hundred sixty-four thousand, seven".