25222523621 has 2 divisors, whose sum is σ = 25222523622. Its totient is φ = 25222523620.

The previous prime is 25222523611. The next prime is 25222523647. The reversal of 25222523621 is 12632522252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23009856100 + 2212667521 = 151690^2 + 47039^2 .

It is a cyclic number.

It is not a de Polignac number, because 25222523621 - 2³⁴ = 8042654437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25222523611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12611261810 + 12611261811.

It is an arithmetic number, because the mean of its divisors is an integer number (12611261811).

Almost surely, 2^25222523621 is an apocalyptic number.

It is an amenable number.

25222523621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25222523621 is an equidigital number, since it uses as much as digits as its factorization.

25222523621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 32.

The spelling of 25222523621 in words is "twenty-five billion, two hundred twenty-two million, five hundred twenty-three thousand, six hundred twenty-one".