23503649481 has 27 divisors (see below), whose sum is σ = 36771472647. Its totient is φ = 14460104880.

The previous prime is 23503649447. The next prime is 23503649531. The reversal of 23503649481 is 18494630532.

The square root of 23503649481 is 153309.

It is a perfect power (a square), and thus also a powerful number.

23503649481 is a `hidden beast` number, since 2 + 3 + 50 + 36 + 494 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3476871225 + 20026778256 = 58965^2 + 141516^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23503649481 is a prime.

It is a super-2 number, since 2×23503649481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23503649441) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5977086 + ... + 5981016.

Almost surely, 2^23503649481 is an apocalyptic number.

23503649481 is the 153309-th square number.

23503649481 is the 76655-th centered octagonal number.

It is an amenable number.

23503649481 is a deficient number, since it is larger than the sum of its proper divisors (13267823166).

23503649481 is an frugal number, since it uses more digits than its factorization.

23503649481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7894 (or 3947 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 23503649481 in words is "twenty-three billion, five hundred three million, six hundred forty-nine thousand, four hundred eighty-one".