25957682856666 has 128 divisors (see below), whose sum is σ = 63276783206400. Its totient is φ = 7822356696000.

The previous prime is 25957682856641. The next prime is 25957682856701. The reversal of 25957682856666 is 66665828675952.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 384461851 + ... + 384529361.

It is an arithmetic number, because the mean of its divisors is an integer number (494349868800).

Almost surely, 2^{25957682856666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25957682856666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31638391603200).

25957682856666 is an abundant number, since it is smaller than the sum of its proper divisors (37319100349734).

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

25957682856666 is a wasteful number, since it uses less digits than its factorization.

25957682856666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71113 (or 71107 counting only the distinct ones).

The product of its digits is 15676416000, while the sum is 81.

The spelling of 25957682856666 in words is "twenty-five trillion, nine hundred fifty-seven billion, six hundred eighty-two million, eight hundred fifty-six thousand, six hundred sixty-six".