66151681333 has 4 divisors (see below), whose sum is σ = 66201759628. Its totient is φ = 66101603040.

The previous prime is 66151681327. The next prime is 66151681361. The reversal of 66151681333 is 33318615166.

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 53591324004 + 12560357329 = 231498^2 + 112073^2 .

It is a cyclic number.

It is not a de Polignac number, because 66151681333 - 2⁹ = 66151680821 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 66151681333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66151685333) 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, 25037166 + ... + 25039807.

It is an arithmetic number, because the mean of its divisors is an integer number (16550439907).

Almost surely, 2^66151681333 is an apocalyptic number.

It is an amenable number.

66151681333 is a deficient number, since it is larger than the sum of its proper divisors (50078295).

66151681333 is a wasteful number, since it uses less digits than its factorization.

66151681333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50078294.

The product of its digits is 233280, while the sum is 43.

The spelling of 66151681333 in words is "sixty-six billion, one hundred fifty-one million, six hundred eighty-one thousand, three hundred thirty-three".