25583450621 has 2 divisors, whose sum is σ = 25583450622. Its totient is φ = 25583450620.

The previous prime is 25583450573. The next prime is 25583450623. The reversal of 25583450621 is 12605438552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25117495225 + 465955396 = 158485^2 + 21586^2 .

It is a cyclic number.

It is not a de Polignac number, because 25583450621 - 2¹⁴ = 25583434237 is a prime.

Together with 25583450623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25583450623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12791725310 + 12791725311.

It is an arithmetic number, because the mean of its divisors is an integer number (12791725311).

Almost surely, 2^25583450621 is an apocalyptic number.

It is an amenable number.

25583450621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25583450621 is an equidigital number, since it uses as much as digits as its factorization.

25583450621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 25583450621 in words is "twenty-five billion, five hundred eighty-three million, four hundred fifty thousand, six hundred twenty-one".