261587876656188 has 24 divisors (see below), whose sum is σ = 612321781574608. Its totient is φ = 86917377545856.

The previous prime is 261587876656177. The next prime is 261587876656213. The reversal of 261587876656188 is 881656678785162.

It is a self number, because there is not a number n which added to its sum of digits gives 261587876656188.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34822663531 + ... + 34822671042.

Almost surely, 2^{261587876656188} is an apocalyptic number.

It is an amenable number.

261587876656188 is an abundant number, since it is smaller than the sum of its proper divisors (350733904918420).

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

261587876656188 is a wasteful number, since it uses less digits than its factorization.

261587876656188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69645334893 (or 69645334891 counting only the distinct ones).

The product of its digits is 13005619200, while the sum is 84.

The spelling of 261587876656188 in words is "two hundred sixty-one trillion, five hundred eighty-seven billion, eight hundred seventy-six million, six hundred fifty-six thousand, one hundred eighty-eight".