66876673 has 2 divisors, whose sum is σ = 66876674. Its totient is φ = 66876672.

The previous prime is 66876671. The next prime is 66876701. The reversal of 66876673 is 37667866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48274704 + 18601969 = 6948^2 + 4313^2 .

It is a cyclic number.

It is not a de Polignac number, because 66876673 - 2¹ = 66876671 is a prime.

Together with 66876671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66876671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33438336 + 33438337.

It is an arithmetic number, because the mean of its divisors is an integer number (33438337).

Almost surely, 2^66876673 is an apocalyptic number.

It is an amenable number.

66876673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66876673 is an equidigital number, since it uses as much as digits as its factorization.

66876673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 49.

The square root of 66876673 is about 8177.8159064630. The cubic root of 66876673 is about 405.9054537301.

The spelling of 66876673 in words is "sixty-six million, eight hundred seventy-six thousand, six hundred seventy-three".