66966967 has 2 divisors, whose sum is σ = 66966968. Its totient is φ = 66966966.

The previous prime is 66966919. The next prime is 66966983. The reversal of 66966967 is 76966966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66966967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66966917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33483483 + 33483484.

It is an arithmetic number, because the mean of its divisors is an integer number (33483484).

Almost surely, 2^66966967 is an apocalyptic number.

66966967 is a deficient number, since it is larger than the sum of its proper divisors (1).

66966967 is an equidigital number, since it uses as much as digits as its factorization.

66966967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 55.

The square root of 66966967 is about 8183.3347114731. The cubic root of 66966967 is about 406.0880502567.

Subtracting 66966967 from its reverse (76966966), we obtain a palindrome (9999999).

The spelling of 66966967 in words is "sixty-six million, nine hundred sixty-six thousand, nine hundred sixty-seven".