25805477899 has 12 divisors (see below), whose sum is σ = 26567497800. Its totient is φ = 25064217024.

The previous prime is 25805477809. The next prime is 25805477909. The reversal of 25805477899 is 99877450852.

It is not a de Polignac number, because 25805477899 - 2²⁵ = 25771923467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25805477899.

It is not an unprimeable number, because it can be changed into a prime (25805477809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 291987 + ... + 369955.

It is an arithmetic number, because the mean of its divisors is an integer number (2213958150).

Almost surely, 2^25805477899 is an apocalyptic number.

25805477899 is a deficient number, since it is larger than the sum of its proper divisors (762019901).

25805477899 is an equidigital number, since it uses as much as digits as its factorization.

25805477899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78234 (or 78191 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 64.

The spelling of 25805477899 in words is "twenty-five billion, eight hundred five million, four hundred seventy-seven thousand, eight hundred ninety-nine".