261298335798 has 24 divisors (see below), whose sum is σ = 566179755336. Its totient is φ = 87094312800.

The previous prime is 261298335757. The next prime is 261298335817. The reversal of 261298335798 is 897533892162.

261298335798 is a `hidden beast` number, since 2 + 6 + 1 + 29 + 8 + 33 + 579 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107268 + ... + 730823.

It is an arithmetic number, because the mean of its divisors is an integer number (23590823139).

Almost surely, 2^261298335798 is an apocalyptic number.

261298335798 is an abundant number, since it is smaller than the sum of its proper divisors (304881419538).

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

261298335798 is a wasteful number, since it uses less digits than its factorization.

261298335798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855420 (or 855417 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 261298335798 in words is "two hundred sixty-one billion, two hundred ninety-eight million, three hundred thirty-five thousand, seven hundred ninety-eight".