25942209156 has 72 divisors (see below), whose sum is σ = 68015637144. Its totient is φ = 8330342400.

The previous prime is 25942209133. The next prime is 25942209187. The reversal of 25942209156 is 65190224952.

25942209156 is a `hidden beast` number, since 2 + 594 + 2 + 2 + 0 + 9 + 1 + 56 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6598962756 + 19343246400 = 81234^2 + 139080^2 .

It is a super-3 number, since 3×25942209156³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38116 + ... + 230948.

It is an arithmetic number, because the mean of its divisors is an integer number (944661627).

Almost surely, 2^25942209156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25942209156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34007818572).

25942209156 is an abundant number, since it is smaller than the sum of its proper divisors (42073427988).

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

25942209156 is a wasteful number, since it uses less digits than its factorization.

25942209156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192981 (or 192976 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 25942209156 in words is "twenty-five billion, nine hundred forty-two million, two hundred nine thousand, one hundred fifty-six".