64680409333 has 4 divisors (see below), whose sum is σ = 64685960140. Its totient is φ = 64674858528.

The previous prime is 64680409309. The next prime is 64680409357. The reversal of 64680409333 is 33390408646.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64680409309) and next prime (64680409357).

It can be written as a sum of positive squares in 2 ways, for example, as 61269615729 + 3410793604 = 247527^2 + 58402^2 .

It is a cyclic number.

It is not a de Polignac number, because 64680409333 - 2¹⁷ = 64680278261 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 (64680409733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2757888 + ... + 2781241.

It is an arithmetic number, because the mean of its divisors is an integer number (16171490035).

Almost surely, 2^64680409333 is an apocalyptic number.

It is an amenable number.

64680409333 is a deficient number, since it is larger than the sum of its proper divisors (5550807).

64680409333 is a wasteful number, since it uses less digits than its factorization.

64680409333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550806.

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 64680409333 in words is "sixty-four billion, six hundred eighty million, four hundred nine thousand, three hundred thirty-three".