23664478065 has 16 divisors (see below), whose sum is σ = 39168792000. Its totient is φ = 12185845952.

The previous prime is 23664477961. The next prime is 23664478069. The reversal of 23664478065 is 56087446632.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 23664478065 - 2¹⁸ = 23664215921 is a prime.

It is a super-2 number, since 2×23664478065² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 23664477999 and 23664478017.

It is not an unprimeable number, because it can be changed into a prime (23664478069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27200115 + ... + 27200984.

It is an arithmetic number, because the mean of its divisors is an integer number (2448049500).

Almost surely, 2^23664478065 is an apocalyptic number.

It is an amenable number.

23664478065 is a deficient number, since it is larger than the sum of its proper divisors (15504313935).

23664478065 is a wasteful number, since it uses less digits than its factorization.

23664478065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54401136.

The product of its (nonzero) digits is 5806080, while the sum is 51.

The spelling of 23664478065 in words is "twenty-three billion, six hundred sixty-four million, four hundred seventy-eight thousand, sixty-five".