261166734 has 32 divisors (see below), whose sum is σ = 581057280. Its totient is φ = 86952600.

The previous prime is 261166693. The next prime is 261166751. The reversal of 261166734 is 437661162.

It is a happy number.

261166734 is a `hidden beast` number, since 2 + 611 + 6 + 6 + 7 + 34 = 666.

261166734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53329 + ... + 58019.

It is an arithmetic number, because the mean of its divisors is an integer number (18158040).

Almost surely, 2^261166734 is an apocalyptic number.

261166734 is an abundant number, since it is smaller than the sum of its proper divisors (319890546).

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

261166734 is a wasteful number, since it uses less digits than its factorization.

261166734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733 (or 5727 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 261166734 is about 16160.6538852857. The cubic root of 261166734 is about 639.2037085540.

The spelling of 261166734 in words is "two hundred sixty-one million, one hundred sixty-six thousand, seven hundred thirty-four".