66371388645 has 32 divisors (see below), whose sum is σ = 106981056000. Its totient is φ = 35136751104.

The previous prime is 66371388641. The next prime is 66371388649. The reversal of 66371388645 is 54688317366.

It is an interprime number because it is at equal distance from previous prime (66371388641) and next prime (66371388649).

It is not a de Polignac number, because 66371388645 - 2² = 66371388641 is a prime.

It is a super-2 number, since 2×66371388645² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66371388641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1092531 + ... + 1151679.

It is an arithmetic number, because the mean of its divisors is an integer number (3343158000).

Almost surely, 2^66371388645 is an apocalyptic number.

It is an amenable number.

66371388645 is a deficient number, since it is larger than the sum of its proper divisors (40609667355).

66371388645 is a wasteful number, since it uses less digits than its factorization.

66371388645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59709.

The product of its digits is 17418240, while the sum is 57.

The spelling of 66371388645 in words is "sixty-six billion, three hundred seventy-one million, three hundred eighty-eight thousand, six hundred forty-five".