25815800797 has 4 divisors (see below), whose sum is σ = 25819919836. Its totient is φ = 25811681760.

The previous prime is 25815800767. The next prime is 25815800809. The reversal of 25815800797 is 79700851852.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17309612356 + 8506188441 = 131566^2 + 92229^2 .

It is a cyclic number.

It is not a de Polignac number, because 25815800797 - 2¹⁵ = 25815768029 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 (25815800767) 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, 2050104 + ... + 2062657.

It is an arithmetic number, because the mean of its divisors is an integer number (6454979959).

Almost surely, 2^25815800797 is an apocalyptic number.

It is an amenable number.

25815800797 is a deficient number, since it is larger than the sum of its proper divisors (4119039).

25815800797 is an equidigital number, since it uses as much as digits as its factorization.

25815800797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119038.

The product of its (nonzero) digits is 1411200, while the sum is 52.

The spelling of 25815800797 in words is "twenty-five billion, eight hundred fifteen million, eight hundred thousand, seven hundred ninety-seven".