25638440715542 has 8 divisors (see below), whose sum is σ = 38558072722176. Its totient is φ = 12785749808152.

The previous prime is 25638440715493. The next prime is 25638440715617. The reversal of 25638440715542 is 24551704483652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16735273853 + ... + 16735275384.

It is an arithmetic number, because the mean of its divisors is an integer number (4819759090272).

Almost surely, 2^{25638440715542} is an apocalyptic number.

25638440715542 is a deficient number, since it is larger than the sum of its proper divisors (12919632006634).

25638440715542 is a wasteful number, since it uses less digits than its factorization.

25638440715542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33470549622.

The product of its (nonzero) digits is 32256000, while the sum is 56.

The spelling of 25638440715542 in words is "twenty-five trillion, six hundred thirty-eight billion, four hundred forty million, seven hundred fifteen thousand, five hundred forty-two".