25819812123 has 16 divisors (see below), whose sum is σ = 39404019456. Its totient is φ = 14731849440.

The previous prime is 25819812119. The next prime is 25819812173. The reversal of 25819812123 is 32121891852.

It is not a de Polignac number, because 25819812123 - 2² = 25819812119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25819812113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 916161 + ... + 943922.

It is an arithmetic number, because the mean of its divisors is an integer number (2462751216).

Almost surely, 2^25819812123 is an apocalyptic number.

25819812123 is a deficient number, since it is larger than the sum of its proper divisors (13584207333).

25819812123 is a wasteful number, since it uses less digits than its factorization.

25819812123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860754.

The product of its digits is 69120, while the sum is 42.

The spelling of 25819812123 in words is "twenty-five billion, eight hundred nineteen million, eight hundred twelve thousand, one hundred twenty-three".