66786433 has 4 divisors (see below), whose sum is σ = 76327360. Its totient is φ = 57245508.

The previous prime is 66786403. The next prime is 66786451. The reversal of 66786433 is 33468766.

66786433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-66786433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66786433.

It is not an unprimeable number, because it can be changed into a prime (66786403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4770453 + ... + 4770466.

It is an arithmetic number, because the mean of its divisors is an integer number (19081840).

Almost surely, 2^66786433 is an apocalyptic number.

It is an amenable number.

66786433 is a deficient number, since it is larger than the sum of its proper divisors (9540927).

66786433 is an equidigital number, since it uses as much as digits as its factorization.

66786433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9540926.

The product of its digits is 435456, while the sum is 43.

The square root of 66786433 is about 8172.2966784130. The cubic root of 66786433 is about 405.7228021221.

The spelling of 66786433 in words is "sixty-six million, seven hundred eighty-six thousand, four hundred thirty-three".