261333646 has 16 divisors (see below), whose sum is σ = 448212960. Its totient is φ = 111947040.

The previous prime is 261333641. The next prime is 261333647. The reversal of 261333646 is 646333162.

It is a super-4 number, since 4×261333646⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261333641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45876 + ... + 51256.

It is an arithmetic number, because the mean of its divisors is an integer number (28013310).

Almost surely, 2^261333646 is an apocalyptic number.

261333646 is a deficient number, since it is larger than the sum of its proper divisors (186879314).

261333646 is a wasteful number, since it uses less digits than its factorization.

261333646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8859.

The product of its digits is 46656, while the sum is 34.

The square root of 261333646 is about 16165.8172079236. The cubic root of 261333646 is about 639.3398515294.

The spelling of 261333646 in words is "two hundred sixty-one million, three hundred thirty-three thousand, six hundred forty-six".