25861555020535 has 32 divisors (see below), whose sum is σ = 35304402792960. Its totient is φ = 18028686492288.

The previous prime is 25861555020493. The next prime is 25861555020569. The reversal of 25861555020535 is 53502055516852.

It is a cyclic number.

It is not a de Polignac number, because 25861555020535 - 2⁷ = 25861555020407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36647899 + ... + 37346908.

It is an arithmetic number, because the mean of its divisors is an integer number (1103262587280).

Almost surely, 2^{25861555020535} is an apocalyptic number.

25861555020535 is a deficient number, since it is larger than the sum of its proper divisors (9442847772425).

25861555020535 is a wasteful number, since it uses less digits than its factorization.

25861555020535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73995127.

The product of its (nonzero) digits is 9000000, while the sum is 52.

The spelling of 25861555020535 in words is "twenty-five trillion, eight hundred sixty-one billion, five hundred fifty-five million, twenty thousand, five hundred thirty-five".