166212993 has 4 divisors (see below), whose sum is σ = 221617328. Its totient is φ = 110808660.

The previous prime is 166212967. The next prime is 166213027. The reversal of 166212993 is 399212661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166212993 - 2⁸ = 166212737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166212913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27702163 + ... + 27702168.

It is an arithmetic number, because the mean of its divisors is an integer number (55404332).

Almost surely, 2^166212993 is an apocalyptic number.

It is an amenable number.

166212993 is a deficient number, since it is larger than the sum of its proper divisors (55404335).

166212993 is an equidigital number, since it uses as much as digits as its factorization.

166212993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55404334.

The product of its digits is 34992, while the sum is 39.

The square root of 166212993 is about 12892.3618084508. The cubic root of 166212993 is about 549.8214219140.

The spelling of 166212993 in words is "one hundred sixty-six million, two hundred twelve thousand, nine hundred ninety-three".