166212997 has 8 divisors (see below), whose sum is σ = 168980000. Its totient is φ = 163454544.

The previous prime is 166212967. The next prime is 166213027. The reversal of 166212997 is 799212661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166212967) and next prime (166213027).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166212997 - 2⁷ = 166212869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166212947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45754 + ... + 49252.

It is an arithmetic number, because the mean of its divisors is an integer number (21122500).

Almost surely, 2^166212997 is an apocalyptic number.

It is an amenable number.

166212997 is a deficient number, since it is larger than the sum of its proper divisors (2767003).

166212997 is an equidigital number, since it uses as much as digits as its factorization.

166212997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4275.

The product of its digits is 81648, while the sum is 43.

The square root of 166212997 is about 12892.3619635814. The cubic root of 166212997 is about 549.8214263246.

The spelling of 166212997 in words is "one hundred sixty-six million, two hundred twelve thousand, nine hundred ninety-seven".