66777666143 has 2 divisors, whose sum is σ = 66777666144. Its totient is φ = 66777666142.

The previous prime is 66777666107. The next prime is 66777666157. The reversal of 66777666143 is 34166677766.

66777666143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66777666143 - 2¹⁴ = 66777649759 is a prime.

It is a super-3 number, since 3×66777666143³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66777666103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33388833071 + 33388833072.

It is an arithmetic number, because the mean of its divisors is an integer number (33388833072).

Almost surely, 2^66777666143 is an apocalyptic number.

66777666143 is a deficient number, since it is larger than the sum of its proper divisors (1).

66777666143 is an equidigital number, since it uses as much as digits as its factorization.

66777666143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 59.

The spelling of 66777666143 in words is "sixty-six billion, seven hundred seventy-seven million, six hundred sixty-six thousand, one hundred forty-three".