261594066 has 8 divisors (see below), whose sum is σ = 523188144. Its totient is φ = 87198020.

The previous prime is 261594059. The next prime is 261594083. The reversal of 261594066 is 660495162.

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

261594066 is an admirable 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, 21799500 + ... + 21799511.

It is an arithmetic number, because the mean of its divisors is an integer number (65398518).

Almost surely, 2^261594066 is an apocalyptic number.

261594066 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.

261594066 is a wasteful number, since it uses less digits than its factorization.

261594066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43599016.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 261594066 is about 16173.8698523266. The cubic root of 261594066 is about 639.5521492471.

The spelling of 261594066 in words is "two hundred sixty-one million, five hundred ninety-four thousand, sixty-six".