261611474616 has 24 divisors (see below), whose sum is σ = 708531077280. Its totient is φ = 87203824848.

The previous prime is 261611474569. The next prime is 261611474623. The reversal of 261611474616 is 616474116162.

261611474616 is a `hidden beast` number, since 2 + 6 + 16 + 1 + 14 + 7 + 4 + 616 = 666.

261611474616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 5 ways as a sum of consecutive naturals, for example, 1816746280 + ... + 1816746423.

It is an arithmetic number, because the mean of its divisors is an integer number (29522128220).

Almost surely, 2^261611474616 is an apocalyptic number.

It is an amenable number.

261611474616 is an abundant number, since it is smaller than the sum of its proper divisors (446919602664).

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

261611474616 is a wasteful number, since it uses less digits than its factorization.

261611474616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633492715 (or 3633492708 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 261611474616 in words is "two hundred sixty-one billion, six hundred eleven million, four hundred seventy-four thousand, six hundred sixteen".