25540878851 has 4 divisors (see below), whose sum is σ = 26231172912. Its totient is φ = 24850584792.

The previous prime is 25540878817. The next prime is 25540878887. The reversal of 25540878851 is 15887804552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25540878851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25540878793 and 25540878802.

It is not an unprimeable number, because it can be changed into a prime (25540878751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345146975 + ... + 345147048.

It is an arithmetic number, because the mean of its divisors is an integer number (6557793228).

Almost surely, 2^25540878851 is an apocalyptic number.

25540878851 is a deficient number, since it is larger than the sum of its proper divisors (690294061).

25540878851 is an equidigital number, since it uses as much as digits as its factorization.

25540878851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690294060.

The product of its (nonzero) digits is 3584000, while the sum is 53.

The spelling of 25540878851 in words is "twenty-five billion, five hundred forty million, eight hundred seventy-eight thousand, eight hundred fifty-one".