66767867 has 2 divisors, whose sum is σ = 66767868. Its totient is φ = 66767866.

The previous prime is 66767851. The next prime is 66767879. The reversal of 66767867 is 76876766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66767867 - 2⁴ = 66767851 is a prime.

It is not a weakly prime, because it can be changed into another prime (66767807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383933 + 33383934.

It is an arithmetic number, because the mean of its divisors is an integer number (33383934).

Almost surely, 2^66767867 is an apocalyptic number.

66767867 is a deficient number, since it is larger than the sum of its proper divisors (1).

66767867 is an equidigital number, since it uses as much as digits as its factorization.

66767867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 53.

The square root of 66767867 is about 8171.1606886660. The cubic root of 66767867 is about 405.6852029306.

The spelling of 66767867 in words is "sixty-six million, seven hundred sixty-seven thousand, eight hundred sixty-seven".