66433261 has 4 divisors (see below), whose sum is σ = 66731392. Its totient is φ = 66135132.

The previous prime is 66433259. The next prime is 66433271. The reversal of 66433261 is 16233466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66433261 - 2¹ = 66433259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66433201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148731 + ... + 149176.

It is an arithmetic number, because the mean of its divisors is an integer number (16682848).

Almost surely, 2^66433261 is an apocalyptic number.

It is an amenable number.

66433261 is a deficient number, since it is larger than the sum of its proper divisors (298131).

66433261 is a wasteful number, since it uses less digits than its factorization.

66433261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298130.

The product of its digits is 15552, while the sum is 31.

The square root of 66433261 is about 8150.6601573124. The cubic root of 66433261 is about 405.0063729120.

The spelling of 66433261 in words is "sixty-six million, four hundred thirty-three thousand, two hundred sixty-one".