25641446512 has 20 divisors (see below), whose sum is σ = 54196694136. Its totient is φ = 11655202880.

The previous prime is 25641446471. The next prime is 25641446521. The reversal of 25641446512 is 21564414652.

It is a super-2 number, since 2×25641446512² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72844843 + ... + 72845194.

Almost surely, 2^25641446512 is an apocalyptic number.

25641446512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

25641446512 is an abundant number, since it is smaller than the sum of its proper divisors (28555247624).

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

25641446512 is a wasteful number, since it uses less digits than its factorization.

25641446512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145690056 (or 145690050 counting only the distinct ones).

The product of its digits is 230400, while the sum is 40.

The spelling of 25641446512 in words is "twenty-five billion, six hundred forty-one million, four hundred forty-six thousand, five hundred twelve".