25427891644 has 12 divisors (see below), whose sum is σ = 47116387584. Its totient is φ = 11966066624.

The previous prime is 25427891641. The next prime is 25427891677. The reversal of 25427891644 is 44619872452.

It is a junction number, because it is equal to n+sod(n) for n = 25427891591 and 25427891600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25427891641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186969724 + ... + 186969859.

It is an arithmetic number, because the mean of its divisors is an integer number (3926365632).

Almost surely, 2^25427891644 is an apocalyptic number.

It is an amenable number.

25427891644 is a deficient number, since it is larger than the sum of its proper divisors (21688495940).

25427891644 is a wasteful number, since it uses less digits than its factorization.

25427891644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373939604 (or 373939602 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The spelling of 25427891644 in words is "twenty-five billion, four hundred twenty-seven million, eight hundred ninety-one thousand, six hundred forty-four".