166344681 has 8 divisors (see below), whose sum is σ = 221943904. Its totient is φ = 110820960.

The previous prime is 166344631. The next prime is 166344709. The reversal of 166344681 is 186443661.

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

It is not a de Polignac number, because 166344681 - 2⁷ = 166344553 is a prime.

It is a super-2 number, since 2×166344681² = 55341105793983522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166344631) 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 in 7 ways as a sum of consecutive naturals, for example, 13516 + ... + 22701.

It is an arithmetic number, because the mean of its divisors is an integer number (27742988).

Almost surely, 2^166344681 is an apocalyptic number.

It is an amenable number.

166344681 is a deficient number, since it is larger than the sum of its proper divisors (55599223).

166344681 is a wasteful number, since it uses less digits than its factorization.

166344681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37751.

The product of its digits is 82944, while the sum is 39.

The square root of 166344681 is about 12897.4680073261. The cubic root of 166344681 is about 549.9665886040.

The spelling of 166344681 in words is "one hundred sixty-six million, three hundred forty-four thousand, six hundred eighty-one".