25561346138 has 8 divisors (see below), whose sum is σ = 38595940320. Its totient is φ = 12696032700.

The previous prime is 25561346137. The next prime is 25561346159. The reversal of 25561346138 is 83164316552.

It is a happy number.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25561346131) 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, 42319808 + ... + 42320411.

It is an arithmetic number, because the mean of its divisors is an integer number (4824492540).

Almost surely, 2^25561346138 is an apocalyptic number.

25561346138 is a deficient number, since it is larger than the sum of its proper divisors (13034594182).

25561346138 is a wasteful number, since it uses less digits than its factorization.

25561346138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84640372.

The product of its digits is 518400, while the sum is 44.

The spelling of 25561346138 in words is "twenty-five billion, five hundred sixty-one million, three hundred forty-six thousand, one hundred thirty-eight".