66139061611393 has 4 divisors (see below), whose sum is σ = 66481751049988. Its totient is φ = 65796372172800.

The previous prime is 66139061611367. The next prime is 66139061611481. The reversal of 66139061611393 is 39311616093166.

66139061611393 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 44233366767489 + 21905694843904 = 6650817^2 + 4680352^2 .

It is a cyclic number.

It is not a de Polignac number, because 66139061611393 - 2²⁹ = 66138524740481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66139061621393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171344719008 + ... + 171344719393.

It is an arithmetic number, because the mean of its divisors is an integer number (16620437762497).

Almost surely, 2^{66139061611393} is an apocalyptic number.

It is an amenable number.

66139061611393 is a deficient number, since it is larger than the sum of its proper divisors (342689438595).

66139061611393 is a wasteful number, since it uses less digits than its factorization.

66139061611393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342689438594.

The product of its (nonzero) digits is 2834352, while the sum is 55.

The spelling of 66139061611393 in words is "sixty-six trillion, one hundred thirty-nine billion, sixty-one million, six hundred eleven thousand, three hundred ninety-three".