667728163 has 2 divisors, whose sum is σ = 667728164. Its totient is φ = 667728162.

The previous prime is 667728137. The next prime is 667728179. The reversal of 667728163 is 361827766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667728163 - 2¹³ = 667719971 is a prime.

It is not a weakly prime, because it can be changed into another prime (667728263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333864081 + 333864082.

It is an arithmetic number, because the mean of its divisors is an integer number (333864082).

Almost surely, 2^667728163 is an apocalyptic number.

667728163 is a deficient number, since it is larger than the sum of its proper divisors (1).

667728163 is an equidigital number, since it uses as much as digits as its factorization.

667728163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 667728163 is about 25840.4365868690. The cubic root of 667728163 is about 874.0438701018.

The spelling of 667728163 in words is "six hundred sixty-seven million, seven hundred twenty-eight thousand, one hundred sixty-three".