261685683 has 24 divisors (see below), whose sum is σ = 437465600. Its totient is φ = 147639024.

The previous prime is 261685673. The next prime is 261685687. The reversal of 261685683 is 386586162.

261685683 is a `hidden beast` number, since 26 + 1 + 68 + 568 + 3 = 666.

261685683 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261685683 - 2⁸ = 261685427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261685687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21313 + ... + 31266.

Almost surely, 2^261685683 is an apocalyptic number.

261685683 is a deficient number, since it is larger than the sum of its proper divisors (175779917).

261685683 is a wasteful number, since it uses less digits than its factorization.

261685683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52671 (or 52668 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 261685683 is about 16176.7018579190. The cubic root of 261685683 is about 639.6268030942.

The spelling of 261685683 in words is "two hundred sixty-one million, six hundred eighty-five thousand, six hundred eighty-three".