64404701209 has 4 divisors (see below), whose sum is σ = 65042371620. Its totient is φ = 63767030800.

The previous prime is 64404701191. The next prime is 64404701219. The reversal of 64404701209 is 90210740446.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61666795584 + 2737905625 = 248328^2 + 52325^2 .

It is a cyclic number.

It is not a de Polignac number, because 64404701209 - 2⁹ = 64404700697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64404701219) 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, 318835054 + ... + 318835255.

It is an arithmetic number, because the mean of its divisors is an integer number (16260592905).

Almost surely, 2^64404701209 is an apocalyptic number.

It is an amenable number.

64404701209 is a deficient number, since it is larger than the sum of its proper divisors (637670411).

64404701209 is a wasteful number, since it uses less digits than its factorization.

64404701209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637670410.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 64404701209 in words is "sixty-four billion, four hundred four million, seven hundred one thousand, two hundred nine".