261416646 has 20 divisors (see below), whose sum is σ = 585767292. Its totient is φ = 87138828.

The previous prime is 261416641. The next prime is 261416681. The reversal of 261416646 is 646614162.

261416646 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 1 + 6 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 261416646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261416641) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 806680 + ... + 807003.

Almost surely, 2^261416646 is an apocalyptic number.

261416646 is an abundant number, since it is smaller than the sum of its proper divisors (324350646).

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

261416646 is a wasteful number, since it uses less digits than its factorization.

261416646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613697 (or 1613688 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 261416646 is about 16168.3841493205. The cubic root of 261416646 is about 639.4075294980.

The spelling of 261416646 in words is "two hundred sixty-one million, four hundred sixteen thousand, six hundred forty-six".