667222811 has 2 divisors, whose sum is σ = 667222812. Its totient is φ = 667222810.

The previous prime is 667222793. The next prime is 667222841. The reversal of 667222811 is 118222766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667222811 - 2⁶ = 667222747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (667222841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333611405 + 333611406.

It is an arithmetic number, because the mean of its divisors is an integer number (333611406).

Almost surely, 2^667222811 is an apocalyptic number.

667222811 is a deficient number, since it is larger than the sum of its proper divisors (1).

667222811 is an equidigital number, since it uses as much as digits as its factorization.

667222811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 667222811 is about 25830.6564182949. The cubic root of 667222811 is about 873.8233156313.

The spelling of 667222811 in words is "six hundred sixty-seven million, two hundred twenty-two thousand, eight hundred eleven".