25785203857 has 4 divisors (see below), whose sum is σ = 29468804416. Its totient is φ = 22101603300.

The previous prime is 25785203813. The next prime is 25785203887. The reversal of 25785203857 is 75830258752.

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 not a de Polignac number, because 25785203857 - 2²³ = 25776815249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25785203887) 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, 1841800269 + ... + 1841800282.

It is an arithmetic number, because the mean of its divisors is an integer number (7367201104).

Almost surely, 2^25785203857 is an apocalyptic number.

It is an amenable number.

25785203857 is a deficient number, since it is larger than the sum of its proper divisors (3683600559).

25785203857 is an equidigital number, since it uses as much as digits as its factorization.

25785203857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683600558.

The product of its (nonzero) digits is 4704000, while the sum is 52.

The spelling of 25785203857 in words is "twenty-five billion, seven hundred eighty-five million, two hundred three thousand, eight hundred fifty-seven".