25363914921 has 6 divisors (see below), whose sum is σ = 36636766010. Its totient is φ = 16909276608.

The previous prime is 25363914887. The next prime is 25363914931. The reversal of 25363914921 is 12941936352.

25363914921 is a `hidden beast` number, since 2 + 5 + 3 + 639 + 1 + 4 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25197117696 + 166797225 = 158736^2 + 12915^2 .

It is not a de Polignac number, because 25363914921 - 2¹⁸ = 25363652777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25363914931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1409106376 + ... + 1409106393.

Almost surely, 2^25363914921 is an apocalyptic number.

It is an amenable number.

25363914921 is a deficient number, since it is larger than the sum of its proper divisors (11272851089).

25363914921 is a wasteful number, since it uses less digits than its factorization.

25363914921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818212775 (or 2818212772 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The spelling of 25363914921 in words is "twenty-five billion, three hundred sixty-three million, nine hundred fourteen thousand, nine hundred twenty-one".