166010861 has 2 divisors, whose sum is σ = 166010862. Its totient is φ = 166010860.

The previous prime is 166010839. The next prime is 166010903. The reversal of 166010861 is 168010661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163353961 + 2656900 = 12781^2 + 1630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166010861 is a prime.

It is a super-2 number, since 2×166010861² = 55119211939922642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166010261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83005430 + 83005431.

It is an arithmetic number, because the mean of its divisors is an integer number (83005431).

Almost surely, 2^166010861 is an apocalyptic number.

It is an amenable number.

166010861 is a deficient number, since it is larger than the sum of its proper divisors (1).

166010861 is an equidigital number, since it uses as much as digits as its factorization.

166010861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 166010861 is about 12884.5202083741. The cubic root of 166010861 is about 549.5984518096.

It can be divided in two parts, 1660 and 10861, that added together give a palindrome (12521).

The spelling of 166010861 in words is "one hundred sixty-six million, ten thousand, eight hundred sixty-one".