261766134 has 48 divisors (see below), whose sum is σ = 676681200. Its totient is φ = 74789568.

The previous prime is 261766133. The next prime is 261766159. The reversal of 261766134 is 431667162.

It is a happy number.

261766134 is a `hidden beast` number, since 2 + 617 + 6 + 6 + 1 + 34 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261766133) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 46819 + ... + 52110.

It is an arithmetic number, because the mean of its divisors is an integer number (14097525).

Almost surely, 2^261766134 is an apocalyptic number.

261766134 is an abundant number, since it is smaller than the sum of its proper divisors (414915066).

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

261766134 is a wasteful number, since it uses less digits than its factorization.

261766134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98954 (or 98941 counting only the distinct ones).

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

The square root of 261766134 is about 16179.1882985519. The cubic root of 261766134 is about 639.6923439916.

The spelling of 261766134 in words is "two hundred sixty-one million, seven hundred sixty-six thousand, one hundred thirty-four".