25952940138 has 8 divisors (see below), whose sum is σ = 51905880288. Its totient is φ = 8650980044.

The previous prime is 25952940133. The next prime is 25952940173. The reversal of 25952940138 is 83104925952.

It is a happy number.

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

25952940138 is an admirable number.

It is a super-2 number, since 2×25952940138² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25952940133) 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, 2162745006 + ... + 2162745017.

It is an arithmetic number, because the mean of its divisors is an integer number (6488235036).

Almost surely, 2^25952940138 is an apocalyptic number.

25952940138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25952940138 is a wasteful number, since it uses less digits than its factorization.

25952940138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325490028.

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 25952940138 in words is "twenty-five billion, nine hundred fifty-two million, nine hundred forty thousand, one hundred thirty-eight".