165667951 has 2 divisors, whose sum is σ = 165667952. Its totient is φ = 165667950.

The previous prime is 165667927. The next prime is 165667961. The reversal of 165667951 is 159766561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165667951 - 2⁷ = 165667823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165667961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82833975 + 82833976.

It is an arithmetic number, because the mean of its divisors is an integer number (82833976).

Almost surely, 2^165667951 is an apocalyptic number.

165667951 is a deficient number, since it is larger than the sum of its proper divisors (1).

165667951 is an equidigital number, since it uses as much as digits as its factorization.

165667951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 46.

The square root of 165667951 is about 12871.2062760256. The cubic root of 165667951 is about 549.2197763517.

The spelling of 165667951 in words is "one hundred sixty-five million, six hundred sixty-seven thousand, nine hundred fifty-one".