646665433 has 8 divisors (see below), whose sum is σ = 675785088. Its totient is φ = 618185904.

The previous prime is 646665427. The next prime is 646665451. The reversal of 646665433 is 334566646.

It is a happy number.

646665433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-646665433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

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 646665433.

It is not an unprimeable number, because it can be changed into a prime (646665413) 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, 157966 + ... + 162007.

It is an arithmetic number, because the mean of its divisors is an integer number (84473136).

Almost surely, 2^646665433 is an apocalyptic number.

It is an amenable number.

646665433 is a deficient number, since it is larger than the sum of its proper divisors (29119655).

646665433 is a wasteful number, since it uses less digits than its factorization.

646665433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320063.

The product of its digits is 933120, while the sum is 43.

The square root of 646665433 is about 25429.6172405327. The cubic root of 646665433 is about 864.7552663919.

The spelling of 646665433 in words is "six hundred forty-six million, six hundred sixty-five thousand, four hundred thirty-three".