66664313533 has 4 divisors (see below), whose sum is σ = 66668426428. Its totient is φ = 66660200640.

The previous prime is 66664313531. The next prime is 66664313579. The reversal of 66664313533 is 33531346666.

66664313533 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.

It can be written as a sum of positive squares in 2 ways, for example, as 29136100249 + 37528213284 = 170693^2 + 193722^2 .

It is a cyclic number.

It is not a de Polignac number, because 66664313533 - 2¹ = 66664313531 is a prime.

It is a super-2 number, since 2×66664313533² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664313531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032038 + ... + 2064583.

It is an arithmetic number, because the mean of its divisors is an integer number (16667106607).

Almost surely, 2^66664313533 is an apocalyptic number.

It is an amenable number.

66664313533 is a deficient number, since it is larger than the sum of its proper divisors (4112895).

66664313533 is a wasteful number, since it uses less digits than its factorization.

66664313533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112894.

The product of its digits is 2099520, while the sum is 46.

The spelling of 66664313533 in words is "sixty-six billion, six hundred sixty-four million, three hundred thirteen thousand, five hundred thirty-three".