25427924638 has 4 divisors (see below), whose sum is σ = 38141886960. Its totient is φ = 12713962318.

The previous prime is 25427924617. The next prime is 25427924657. The reversal of 25427924638 is 83642972452.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6356981158 + ... + 6356981161.

It is an arithmetic number, because the mean of its divisors is an integer number (9535471740).

Almost surely, 2^25427924638 is an apocalyptic number.

25427924638 is a deficient number, since it is larger than the sum of its proper divisors (12713962322).

25427924638 is a wasteful number, since it uses less digits than its factorization.

25427924638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12713962321.

The product of its digits is 5806080, while the sum is 52.

The spelling of 25427924638 in words is "twenty-five billion, four hundred twenty-seven million, nine hundred twenty-four thousand, six hundred thirty-eight".