66681020183 has 2 divisors, whose sum is σ = 66681020184. Its totient is φ = 66681020182.

The previous prime is 66681020173. The next prime is 66681020249. The reversal of 66681020183 is 38102018666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66681020183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66681020183.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66681020113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33340510091 + 33340510092.

It is an arithmetic number, because the mean of its divisors is an integer number (33340510092).

Almost surely, 2^66681020183 is an apocalyptic number.

66681020183 is a deficient number, since it is larger than the sum of its proper divisors (1).

66681020183 is an equidigital number, since it uses as much as digits as its factorization.

66681020183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 66681020183 in words is "sixty-six billion, six hundred eighty-one million, twenty thousand, one hundred eighty-three".