25993522779721 has 32 divisors (see below), whose sum is σ = 31515962284800. Its totient is φ = 21412314000000.

The previous prime is 25993522779691. The next prime is 25993522779727. The reversal of 25993522779721 is 12797722539952.

It is not a de Polignac number, because 25993522779721 - 2²⁹ = 25992985908809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25993522779727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12851530 + ... + 14735971.

It is an arithmetic number, because the mean of its divisors is an integer number (984873821400).

Almost surely, 2^{25993522779721} is an apocalyptic number.

It is an amenable number.

25993522779721 is a deficient number, since it is larger than the sum of its proper divisors (5522439505079).

25993522779721 is an equidigital number, since it uses as much as digits as its factorization.

25993522779721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27587630 (or 27587616 counting only the distinct ones).

The product of its digits is 300056400, while the sum is 70.

The spelling of 25993522779721 in words is "twenty-five trillion, nine hundred ninety-three billion, five hundred twenty-two million, seven hundred seventy-nine thousand, seven hundred twenty-one".