261535408692 has 96 divisors (see below), whose sum is σ = 622941580800. Its totient is φ = 85386307200.

The previous prime is 261535408639. The next prime is 261535408703. The reversal of 261535408692 is 296804535162.

It is a happy number.

261535408692 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153934059 + ... + 153935757.

It is an arithmetic number, because the mean of its divisors is an integer number (6488974800).

Almost surely, 2^261535408692 is an apocalyptic number.

It is an amenable number.

261535408692 is an abundant number, since it is smaller than the sum of its proper divisors (361406172108).

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

261535408692 is a wasteful number, since it uses less digits than its factorization.

261535408692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101 (or 3099 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 261535408692 in words is "two hundred sixty-one billion, five hundred thirty-five million, four hundred eight thousand, six hundred ninety-two".