66511701671 has 2 divisors, whose sum is σ = 66511701672. Its totient is φ = 66511701670.

The previous prime is 66511701631. The next prime is 66511701703. The reversal of 66511701671 is 17610711566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66511701671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66511701631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33255850835 + 33255850836.

It is an arithmetic number, because the mean of its divisors is an integer number (33255850836).

Almost surely, 2^66511701671 is an apocalyptic number.

66511701671 is a deficient number, since it is larger than the sum of its proper divisors (1).

66511701671 is an equidigital number, since it uses as much as digits as its factorization.

66511701671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 41.

The spelling of 66511701671 in words is "sixty-six billion, five hundred eleven million, seven hundred one thousand, six hundred seventy-one".