25491854144 has 28 divisors (see below), whose sum is σ = 53561012004. Its totient is φ = 11996166144.

The previous prime is 25491854123. The next prime is 25491854149. The reversal of 25491854144 is 44145819452.

It can be written as a sum of positive squares in 2 ways, for example, as 10792716544 + 14699137600 = 103888^2 + 121240^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25491854149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11713919 + ... + 11716094.

Almost surely, 2^25491854144 is an apocalyptic number.

It is an amenable number.

25491854144 is an abundant number, since it is smaller than the sum of its proper divisors (28069157860).

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

25491854144 is a wasteful number, since it uses less digits than its factorization.

25491854144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23430042 (or 23430032 counting only the distinct ones).

The product of its digits is 921600, while the sum is 47.

The spelling of 25491854144 in words is "twenty-five billion, four hundred ninety-one million, eight hundred fifty-four thousand, one hundred forty-four".