166010881 has 4 divisors (see below), whose sum is σ = 166038832. Its totient is φ = 165982932.

The previous prime is 166010861. The next prime is 166010903. The reversal of 166010881 is 188010661.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 166010881 - 2⁷ = 166010753 is a prime.

It is a super-2 number, since 2×166010881² = 55119225220792322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166010861) 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, 1131 + ... + 18256.

It is an arithmetic number, because the mean of its divisors is an integer number (41509708).

Almost surely, 2^166010881 is an apocalyptic number.

It is an amenable number.

166010881 is a deficient number, since it is larger than the sum of its proper divisors (27951).

166010881 is an equidigital number, since it uses as much as digits as its factorization.

166010881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27950.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 166010881 is about 12884.5209844992. The cubic root of 166010881 is about 549.5984738803.

The spelling of 166010881 in words is "one hundred sixty-six million, ten thousand, eight hundred eighty-one".