166840861 has 8 divisors (see below), whose sum is σ = 182528064. Its totient is φ = 151240320.

The previous prime is 166840837. The next prime is 166840871. The reversal of 166840861 is 168048661.

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

It is a de Polignac number, because none of the positive numbers 2^k-166840861 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 (166840801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17601 + ... + 25366.

It is an arithmetic number, because the mean of its divisors is an integer number (22816008).

Almost surely, 2^166840861 is an apocalyptic number.

166840861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166840861 is a deficient number, since it is larger than the sum of its proper divisors (15687203).

166840861 is a wasteful number, since it uses less digits than its factorization.

166840861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43331.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 166840861 is about 12916.6892429910. The cubic root of 166840861 is about 550.5128670648.

The spelling of 166840861 in words is "one hundred sixty-six million, eight hundred forty thousand, eight hundred sixty-one".