25978723194 has 32 divisors (see below), whose sum is σ = 52202304000. Its totient is φ = 8618862384.

The previous prime is 25978723193. The next prime is 25978723223. The reversal of 25978723194 is 49132787952.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25978723193) 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, 1091877 + ... + 1115415.

It is an arithmetic number, because the mean of its divisors is an integer number (1631322000).

Almost surely, 2^25978723194 is an apocalyptic number.

25978723194 is an abundant number, since it is smaller than the sum of its proper divisors (26223580806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25978723194 is a wasteful number, since it uses less digits than its factorization.

25978723194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24402.

The product of its digits is 7620480, while the sum is 57.

The spelling of 25978723194 in words is "twenty-five billion, nine hundred seventy-eight million, seven hundred twenty-three thousand, one hundred ninety-four".