261063966 has 8 divisors (see below), whose sum is σ = 522127944. Its totient is φ = 87021320.

The previous prime is 261063937. The next prime is 261063983. The reversal of 261063966 is 669360162.

It is a happy number.

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

261063966 is an admirable number.

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, 21755325 + ... + 21755336.

It is an arithmetic number, because the mean of its divisors is an integer number (65265993).

Almost surely, 2^261063966 is an apocalyptic number.

261063966 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.

261063966 is a wasteful number, since it uses less digits than its factorization.

261063966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43510666.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 261063966 is about 16157.4739981224. The cubic root of 261063966 is about 639.1198562402.

The spelling of 261063966 in words is "two hundred sixty-one million, sixty-three thousand, nine hundred sixty-six".