25261520797 has 4 divisors (see below), whose sum is σ = 25264620576. Its totient is φ = 25258421020.

The previous prime is 25261520677. The next prime is 25261520819. The reversal of 25261520797 is 79702516252.

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 25261520797 - 2¹⁵ = 25261488029 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 (25261520497) 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, 1537633 + ... + 1553974.

It is an arithmetic number, because the mean of its divisors is an integer number (6316155144).

Almost surely, 2^25261520797 is an apocalyptic number.

It is an amenable number.

25261520797 is a deficient number, since it is larger than the sum of its proper divisors (3099779).

25261520797 is an equidigital number, since it uses as much as digits as its factorization.

25261520797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099778.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 25261520797 in words is "twenty-five billion, two hundred sixty-one million, five hundred twenty thousand, seven hundred ninety-seven".