25612321894 has 4 divisors (see below), whose sum is σ = 38418482844. Its totient is φ = 12806160946.

The previous prime is 25612321829. The next prime is 25612321913. The reversal of 25612321894 is 49812321652.

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

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 25612321894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6403080472 + ... + 6403080475.

It is an arithmetic number, because the mean of its divisors is an integer number (9604620711).

Almost surely, 2^25612321894 is an apocalyptic number.

25612321894 is a deficient number, since it is larger than the sum of its proper divisors (12806160950).

25612321894 is a wasteful number, since it uses less digits than its factorization.

25612321894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12806160949.

The product of its digits is 207360, while the sum is 43.

The spelling of 25612321894 in words is "twenty-five billion, six hundred twelve million, three hundred twenty-one thousand, eight hundred ninety-four".