23561456521 has 16 divisors (see below), whose sum is σ = 24962688000. Its totient is φ = 22176676368.

The previous prime is 23561456509. The next prime is 23561456543. The reversal of 23561456521 is 12565416532.

It is a cyclic number.

It is not a de Polignac number, because 23561456521 - 2¹¹ = 23561454473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23561456621) 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, 2805090 + ... + 2813476.

It is an arithmetic number, because the mean of its divisors is an integer number (1560168000).

Almost surely, 2^23561456521 is an apocalyptic number.

It is an amenable number.

23561456521 is a deficient number, since it is larger than the sum of its proper divisors (1401231479).

23561456521 is a wasteful number, since it uses less digits than its factorization.

23561456521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9348.

The product of its digits is 216000, while the sum is 40.

The spelling of 23561456521 in words is "twenty-three billion, five hundred sixty-one million, four hundred fifty-six thousand, five hundred twenty-one".