25021230809 has 2 divisors, whose sum is σ = 25021230810. Its totient is φ = 25021230808.

The previous prime is 25021230737. The next prime is 25021230833. The reversal of 25021230809 is 90803212052.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24836814409 + 184416400 = 157597^2 + 13580^2 .

It is a cyclic number.

It is not a de Polignac number, because 25021230809 - 2²⁰ = 25020182233 is a prime.

It is not a weakly prime, because it can be changed into another prime (25021230889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510615404 + 12510615405.

It is an arithmetic number, because the mean of its divisors is an integer number (12510615405).

Almost surely, 2^25021230809 is an apocalyptic number.

It is an amenable number.

25021230809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25021230809 is an equidigital number, since it uses as much as digits as its factorization.

25021230809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 25021230809 in words is "twenty-five billion, twenty-one million, two hundred thirty thousand, eight hundred nine".