261535634982 has 96 divisors (see below), whose sum is σ = 578831760000. Its totient is φ = 85327706880.

The previous prime is 261535634977. The next prime is 261535635071. The reversal of 261535634982 is 289436535162.

It is a happy number.

261535634982 is a `hidden beast` number, since 2 + 6 + 1 + 535 + 63 + 49 + 8 + 2 = 666.

It is a congruent number.

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, 150220632 + ... + 150222372.

It is an arithmetic number, because the mean of its divisors is an integer number (6029497500).

Almost surely, 2^261535634982 is an apocalyptic number.

261535634982 is an abundant number, since it is smaller than the sum of its proper divisors (317296125018).

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

261535634982 is a wasteful number, since it uses less digits than its factorization.

261535634982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686 (or 2683 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The spelling of 261535634982 in words is "two hundred sixty-one billion, five hundred thirty-five million, six hundred thirty-four thousand, nine hundred eighty-two".