25723545221 has 4 divisors (see below), whose sum is σ = 28062049344. Its totient is φ = 23385041100.

The previous prime is 25723545217. The next prime is 25723545241. The reversal of 25723545221 is 12254532752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25723545221 - 2² = 25723545217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25723545241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169252045 + ... + 1169252066.

It is an arithmetic number, because the mean of its divisors is an integer number (7015512336).

Almost surely, 2^25723545221 is an apocalyptic number.

It is an amenable number.

25723545221 is a deficient number, since it is larger than the sum of its proper divisors (2338504123).

25723545221 is a wasteful number, since it uses less digits than its factorization.

25723545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338504122.

The product of its digits is 168000, while the sum is 38.

The spelling of 25723545221 in words is "twenty-five billion, seven hundred twenty-three million, five hundred forty-five thousand, two hundred twenty-one".