166610641 has 8 divisors (see below), whose sum is σ = 170349480. Its totient is φ = 162893952.

The previous prime is 166610627. The next prime is 166610651. The reversal of 166610641 is 146016661.

It can be written as a sum of positive squares in 4 ways, for example, as 104121616 + 62489025 = 10204^2 + 7905^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 166610641 - 2¹⁷ = 166479569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166610651) 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, 10165 + ... + 20893.

It is an arithmetic number, because the mean of its divisors is an integer number (21293685).

Almost surely, 2^166610641 is an apocalyptic number.

It is an amenable number.

166610641 is a deficient number, since it is larger than the sum of its proper divisors (3738839).

166610641 is a wasteful number, since it uses less digits than its factorization.

166610641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11075.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 166610641 is about 12907.7744402356. The cubic root of 166610641 is about 550.2595370131.

The spelling of 166610641 in words is "one hundred sixty-six million, six hundred ten thousand, six hundred forty-one".