23513005521440 has 48 divisors (see below), whose sum is σ = 56041063866648. Its totient is φ = 9321970323456.

The previous prime is 23513005521437. The next prime is 23513005521457. The reversal of 23513005521440 is 4412550031532.

It can be written as a sum of positive squares in 4 ways, for example, as 16312777832464 + 7200227688976 = 4038908^2 + 2683324^2 .

It is a super-2 number, since 2×23513005521440² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23513005521440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650230967 + ... + 650267126.

Almost surely, 2^{23513005521440} is an apocalyptic number.

23513005521440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23513005521440 is an abundant number, since it is smaller than the sum of its proper divisors (32528058345208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23513005521440 is a wasteful number, since it uses less digits than its factorization.

23513005521440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300498221 (or 1300498213 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 23513005521440 its reverse (4412550031532), we get a palindrome (27925555552972).

The spelling of 23513005521440 in words is "twenty-three trillion, five hundred thirteen billion, five million, five hundred twenty-one thousand, four hundred forty".