25261551413 has 4 divisors (see below), whose sum is σ = 28870344480. Its totient is φ = 21652758348.

The previous prime is 25261551379. The next prime is 25261551437. The reversal of 25261551413 is 31415516252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25261551413 - 2²² = 25257357109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25261551313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1804396523 + ... + 1804396536.

It is an arithmetic number, because the mean of its divisors is an integer number (7217586120).

Almost surely, 2^25261551413 is an apocalyptic number.

It is an amenable number.

25261551413 is a deficient number, since it is larger than the sum of its proper divisors (3608793067).

25261551413 is an equidigital number, since it uses as much as digits as its factorization.

25261551413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608793066.

The product of its digits is 36000, while the sum is 35.

The spelling of 25261551413 in words is "twenty-five billion, two hundred sixty-one million, five hundred fifty-one thousand, four hundred thirteen".