261663433 has 8 divisors (see below), whose sum is σ = 282456000. Its totient is φ = 241655568.

The previous prime is 261663397. The next prime is 261663481. The reversal of 261663433 is 334366162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261663433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261663533) 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, 195483 + ... + 196816.

It is an arithmetic number, because the mean of its divisors is an integer number (35307000).

Almost surely, 2^261663433 is an apocalyptic number.

261663433 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

261663433 is a deficient number, since it is larger than the sum of its proper divisors (20792567).

261663433 is a wasteful number, since it uses less digits than its factorization.

261663433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392351.

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

The square root of 261663433 is about 16176.0141258593. The cubic root of 261663433 is about 639.6086743484.

It can be divided in two parts, 2616 and 63433, that added together give a square (66049 = 257²).

The spelling of 261663433 in words is "two hundred sixty-one million, six hundred sixty-three thousand, four hundred thirty-three".