25861666265552 has 40 divisors (see below), whose sum is σ = 55109475434496. Its totient is φ = 11682192940416.

The previous prime is 25861666265543. The next prime is 25861666265641. The reversal of 25861666265552 is 25556266616852.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1322702288 + ... + 1322721839.

Almost surely, 2^{25861666265552} is an apocalyptic number.

It is an amenable number.

25861666265552 is an abundant number, since it is smaller than the sum of its proper divisors (29247809168944).

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

25861666265552 is a wasteful number, since it uses less digits than its factorization.

25861666265552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645424195 (or 2645424189 counting only the distinct ones).

The product of its digits is 311040000, while the sum is 65.

The spelling of 25861666265552 in words is "twenty-five trillion, eight hundred sixty-one billion, six hundred sixty-six million, two hundred sixty-five thousand, five hundred fifty-two".