25463365521 has 16 divisors (see below), whose sum is σ = 37559282688. Its totient is φ = 15214984400.

The previous prime is 25463365517. The next prime is 25463365541. The reversal of 25463365521 is 12556336452.

It is a happy number.

It is not a de Polignac number, because 25463365521 - 2² = 25463365517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25463365541) 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, 5431581 + ... + 5436266.

It is an arithmetic number, because the mean of its divisors is an integer number (2347455168).

Almost surely, 2^25463365521 is an apocalyptic number.

It is an amenable number.

25463365521 is a deficient number, since it is larger than the sum of its proper divisors (12095917167).

25463365521 is a wasteful number, since it uses less digits than its factorization.

25463365521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10867932.

The product of its digits is 648000, while the sum is 42.

The spelling of 25463365521 in words is "twenty-five billion, four hundred sixty-three million, three hundred sixty-five thousand, five hundred twenty-one".