25715065026638 has 64 divisors (see below), whose sum is σ = 43667825362560. Its totient is φ = 11268150423552.

The previous prime is 25715065026631. The next prime is 25715065026643. The reversal of 25715065026638 is 83662056051752.

It is a super-2 number, since 2×25715065026638² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25715065026631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 854391206 + ... + 854421302.

It is an arithmetic number, because the mean of its divisors is an integer number (682309771290).

Almost surely, 2^{25715065026638} is an apocalyptic number.

25715065026638 is a deficient number, since it is larger than the sum of its proper divisors (17952760335922).

25715065026638 is a wasteful number, since it uses less digits than its factorization.

25715065026638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40701.

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 25715065026638 in words is "twenty-five trillion, seven hundred fifteen billion, sixty-five million, twenty-six thousand, six hundred thirty-eight".