66783071 has 2 divisors, whose sum is σ = 66783072. Its totient is φ = 66783070.

The previous prime is 66783061. The next prime is 66783107. The reversal of 66783071 is 17038766.

Together with next prime (66783107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66783071 - 2¹⁰ = 66782047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66783001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33391535 + 33391536.

It is an arithmetic number, because the mean of its divisors is an integer number (33391536).

Almost surely, 2^66783071 is an apocalyptic number.

66783071 is a deficient number, since it is larger than the sum of its proper divisors (1).

66783071 is an equidigital number, since it uses as much as digits as its factorization.

66783071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66783071 is about 8172.0909808934. The cubic root of 66783071 is about 405.7159940381.

It can be divided in two parts, 667 and 83071, that added together give a palindrome (83738).

The spelling of 66783071 in words is "sixty-six million, seven hundred eighty-three thousand, seventy-one".