25931949156 has 27 divisors (see below), whose sum is σ = 65552647251. Its totient is φ = 8643660984.

The previous prime is 25931949143. The next prime is 25931949157. The reversal of 25931949156 is 65194913952.

The square root of 25931949156 is 161034.

It is a perfect power (a square), and thus also a powerful number.

25931949156 is a `hidden beast` number, since 2 + 5 + 93 + 19 + 491 + 56 = 666.

It is a super-2 number, since 2×25931949156² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25931949157) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 952785 + ... + 979623.

Almost surely, 2^25931949156 is an apocalyptic number.

25931949156 is the 161034-th square number.

It is an amenable number.

25931949156 is an abundant number, since it is smaller than the sum of its proper divisors (39620698095).

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

25931949156 is an frugal number, since it uses more digits than its factorization.

25931949156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53688 (or 26844 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 54.

The spelling of 25931949156 in words is "twenty-five billion, nine hundred thirty-one million, nine hundred forty-nine thousand, one hundred fifty-six".