25891223690 has 16 divisors (see below), whose sum is σ = 47368207080. Its totient is φ = 10186710720.

The previous prime is 25891223689. The next prime is 25891223719. The reversal of 25891223690 is 9632219852.

It can be written as a sum of positive squares in 4 ways, for example, as 4900140001 + 20991083689 = 70001^2 + 144883^2 .

It is a super-2 number, since 2×25891223690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21221705 + ... + 21222924.

Almost surely, 2^25891223690 is an apocalyptic number.

25891223690 is a deficient number, since it is larger than the sum of its proper divisors (21476983390).

25891223690 is a wasteful number, since it uses less digits than its factorization.

25891223690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42444697.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 25891223690 in words is "twenty-five billion, eight hundred ninety-one million, two hundred twenty-three thousand, six hundred ninety".