166067731 has 2 divisors, whose sum is σ = 166067732. Its totient is φ = 166067730.

The previous prime is 166067723. The next prime is 166067777. The reversal of 166067731 is 137760661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166067731 - 2³ = 166067723 is a prime.

It is a super-2 number, since 2×166067731² = 55156982558976722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166067711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83033865 + 83033866.

It is an arithmetic number, because the mean of its divisors is an integer number (83033866).

Almost surely, 2^166067731 is an apocalyptic number.

166067731 is a deficient number, since it is larger than the sum of its proper divisors (1).

166067731 is an equidigital number, since it uses as much as digits as its factorization.

166067731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 166067731 is about 12886.7269312266. The cubic root of 166067731 is about 549.6612029159.

The spelling of 166067731 in words is "one hundred sixty-six million, sixty-seven thousand, seven hundred thirty-one".