25484929621 has 2 divisors, whose sum is σ = 25484929622. Its totient is φ = 25484929620.

The previous prime is 25484929579. The next prime is 25484929643. The reversal of 25484929621 is 12692948452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21459027121 + 4025902500 = 146489^2 + 63450^2 .

It is a cyclic number.

It is not a de Polignac number, because 25484929621 - 2⁷ = 25484929493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25484927621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12742464810 + 12742464811.

It is an arithmetic number, because the mean of its divisors is an integer number (12742464811).

Almost surely, 2^25484929621 is an apocalyptic number.

It is an amenable number.

25484929621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25484929621 is an equidigital number, since it uses as much as digits as its factorization.

25484929621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 52.

The spelling of 25484929621 in words is "twenty-five billion, four hundred eighty-four million, nine hundred twenty-nine thousand, six hundred twenty-one".