181596661 has 8 divisors (see below), whose sum is σ = 199465920. Its totient is φ = 164558592.

The previous prime is 181596643. The next prime is 181596691. The reversal of 181596661 is 166695181.

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 181596661 - 2²⁵ = 148042229 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 (181596641) 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, 207340 + ... + 208213.

It is an arithmetic number, because the mean of its divisors is an integer number (24933240).

Almost surely, 2^181596661 is an apocalyptic number.

It is an amenable number.

181596661 is a deficient number, since it is larger than the sum of its proper divisors (17869259).

181596661 is a wasteful number, since it uses less digits than its factorization.

181596661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415595.

The product of its digits is 77760, while the sum is 43.

The square root of 181596661 is about 13475.7805339802. The cubic root of 181596661 is about 566.2861669775.

The spelling of 181596661 in words is "one hundred eighty-one million, five hundred ninety-six thousand, six hundred sixty-one".