261513929736 has 48 divisors (see below), whose sum is σ = 708291333360. Its totient is φ = 87168301920.

The previous prime is 261513929723. The next prime is 261513929749. The reversal of 261513929736 is 637929315162.

261513929736 is a `hidden beast` number, since 2 + 6 + 1 + 513 + 9 + 2 + 97 + 36 = 666.

261513929736 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261513929723) and next prime (261513929749).

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, 3235431 + ... + 3315273.

It is an arithmetic number, because the mean of its divisors is an integer number (14756069445).

Almost surely, 2^261513929736 is an apocalyptic number.

It is an amenable number.

261513929736 is an abundant number, since it is smaller than the sum of its proper divisors (446777403624).

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

261513929736 is a wasteful number, since it uses less digits than its factorization.

261513929736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125346 (or 125339 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The spelling of 261513929736 in words is "two hundred sixty-one billion, five hundred thirteen million, nine hundred twenty-nine thousand, seven hundred thirty-six".