66643052194913 has 4 divisors (see below), whose sum is σ = 66649598030868. Its totient is φ = 66636506358960.

The previous prime is 66643052194903. The next prime is 66643052194963. The reversal of 66643052194913 is 31949125034666.

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 13856768011024 + 52786284183889 = 3722468^2 + 7265417^2 .

It is a cyclic number.

It is not a de Polignac number, because 66643052194913 - 2²⁴ = 66643035417697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66643052194903) 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, 3272902706 + ... + 3272923067.

It is an arithmetic number, because the mean of its divisors is an integer number (16662399507717).

Almost surely, 2^{66643052194913} is an apocalyptic number.

It is an amenable number.

66643052194913 is a deficient number, since it is larger than the sum of its proper divisors (6545835955).

66643052194913 is a wasteful number, since it uses less digits than its factorization.

66643052194913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6545835954.

The product of its (nonzero) digits is 25194240, while the sum is 59.

The spelling of 66643052194913 in words is "sixty-six trillion, six hundred forty-three billion, fifty-two million, one hundred ninety-four thousand, nine hundred thirteen".