261775836981036 has 144 divisors (see below), whose sum is σ = 786434792532480. Its totient is φ = 74584758268800.

The previous prime is 261775836981017. The next prime is 261775836981049. The reversal of 261775836981036 is 630189638577162.

It is a happy number.

261775836981036 is a `hidden beast` number, since 2 + 6 + 1 + 7 + 7 + 583 + 6 + 9 + 8 + 1 + 0 + 36 = 666.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51142065 + ... + 56027336.

It is an arithmetic number, because the mean of its divisors is an integer number (5461352725920).

Almost surely, 2^{261775836981036} is an apocalyptic number.

It is an amenable number.

261775836981036 is an abundant number, since it is smaller than the sum of its proper divisors (524658955551444).

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

261775836981036 is a wasteful number, since it uses less digits than its factorization.

261775836981036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107169786 (or 107169772 counting only the distinct ones).

The product of its (nonzero) digits is 548674560, while the sum is 72.

The spelling of 261775836981036 in words is "two hundred sixty-one trillion, seven hundred seventy-five billion, eight hundred thirty-six million, nine hundred eighty-one thousand, thirty-six".