25781228206512 has 80 divisors (see below), whose sum is σ = 67112061553152. Its totient is φ = 8527868826880.

The previous prime is 25781228206507. The next prime is 25781228206561. The reversal of 25781228206512 is 21560282218752.

It is a super-2 number, since 2×25781228206512² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323207338 + ... + 323287094.

Almost surely, 2^{25781228206512} is an apocalyptic number.

It is an amenable number.

25781228206512 is an abundant number, since it is smaller than the sum of its proper divisors (41330833346640).

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

25781228206512 is a wasteful number, since it uses less digits than its factorization.

25781228206512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131306 (or 131300 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 25781228206512 in words is "twenty-five trillion, seven hundred eighty-one billion, two hundred twenty-eight million, two hundred six thousand, five hundred twelve".