261213366 has 8 divisors (see below), whose sum is σ = 522426744. Its totient is φ = 87071120.

The previous prime is 261213307. The next prime is 261213391. The reversal of 261213366 is 663312162.

It is a sphenic number, since it is the product of 3 distinct primes.

261213366 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21767775 + ... + 21767786.

It is an arithmetic number, because the mean of its divisors is an integer number (65303343).

Almost surely, 2^261213366 is an apocalyptic number.

261213366 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261213366 is a wasteful number, since it uses less digits than its factorization.

261213366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43535566.

The product of its digits is 7776, while the sum is 30.

The square root of 261213366 is about 16162.0965842925. The cubic root of 261213366 is about 639.2417501185.

The spelling of 261213366 in words is "two hundred sixty-one million, two hundred thirteen thousand, three hundred sixty-six".