66672167 has 2 divisors, whose sum is σ = 66672168. Its totient is φ = 66672166.

The previous prime is 66672163. The next prime is 66672173. The reversal of 66672167 is 76127666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66672167 - 2² = 66672163 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66672163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336083 + 33336084.

It is an arithmetic number, because the mean of its divisors is an integer number (33336084).

Almost surely, 2^66672167 is an apocalyptic number.

66672167 is a deficient number, since it is larger than the sum of its proper divisors (1).

66672167 is an equidigital number, since it uses as much as digits as its factorization.

66672167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 66672167 is about 8165.3026275822. The cubic root of 66672167 is about 405.4912841110.

The spelling of 66672167 in words is "sixty-six million, six hundred seventy-two thousand, one hundred sixty-seven".