23201521064 has 8 divisors (see below), whose sum is σ = 43502852010. Its totient is φ = 11600760528.

The previous prime is 23201521061. The next prime is 23201521067. The reversal of 23201521064 is 46012510232.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23201521061) and next prime (23201521067).

It can be written as a sum of positive squares in only one way, i.e., 22882612900 + 318908164 = 151270^2 + 17858^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (23201521061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1450095059 + ... + 1450095074.

Almost surely, 2^23201521064 is an apocalyptic number.

It is an amenable number.

23201521064 is a deficient number, since it is larger than the sum of its proper divisors (20301330946).

23201521064 is a wasteful number, since it uses less digits than its factorization.

23201521064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900190139 (or 2900190135 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 23201521064 in words is "twenty-three billion, two hundred one million, five hundred twenty-one thousand, sixty-four".