25317971712 has 288 divisors, whose sum is σ = 82704491520. Its totient is φ = 7670246400.

The previous prime is 25317971689. The next prime is 25317971719. The reversal of 25317971712 is 21717971352.

25317971712 is a `hidden beast` number, since 2 + 531 + 7 + 97 + 17 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25317971719) 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, 6156537 + ... + 6160647.

Almost surely, 2^25317971712 is an apocalyptic number.

25317971712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25317971712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41352245760).

25317971712 is an abundant number, since it is smaller than the sum of its proper divisors (57386519808).

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

25317971712 is an frugal number, since it uses more digits than its factorization.

25317971712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159 (or 4127 counting only the distinct ones).

The product of its digits is 185220, while the sum is 45.

The spelling of 25317971712 in words is "twenty-five billion, three hundred seventeen million, nine hundred seventy-one thousand, seven hundred twelve".