2561000258660 has 12 divisors (see below), whose sum is σ = 5378100543228. Its totient is φ = 1024400103456.

The previous prime is 2561000258611. The next prime is 2561000258689. The reversal of 2561000258660 is 668520001652.

It can be written as a sum of positive squares in 2 ways, for example, as 1660160094784 + 900840163876 = 1288472^2 + 949126^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 64025006447 + ... + 64025006486.

It is an arithmetic number, because the mean of its divisors is an integer number (448175045269).

Almost surely, 2^{2561000258660} is an apocalyptic number.

2561000258660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2561000258660 is an abundant number, since it is smaller than the sum of its proper divisors (2817100284568).

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

2561000258660 is a wasteful number, since it uses less digits than its factorization.

2561000258660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128050012942 (or 128050012940 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 2561000258660 in words is "two trillion, five hundred sixty-one billion, two hundred fifty-eight thousand, six hundred sixty".