194556661 has 8 divisors (see below), whose sum is σ = 209693624. Its totient is φ = 179444160.

The previous prime is 194556647. The next prime is 194556667. The reversal of 194556661 is 166655491.

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 194463025 = 306^2 + 13945^2 .

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 194556661 - 2⁵ = 194556629 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 (194556667) 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, 12535 + ... + 23371.

It is an arithmetic number, because the mean of its divisors is an integer number (26211703).

Almost surely, 2^194556661 is an apocalyptic number.

It is an amenable number.

194556661 is a deficient number, since it is larger than the sum of its proper divisors (15136963).

194556661 is a wasteful number, since it uses less digits than its factorization.

194556661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12231.

The product of its digits is 194400, while the sum is 43.

The square root of 194556661 is about 13948.3569283267. The cubic root of 194556661 is about 579.4492006401.

The spelling of 194556661 in words is "one hundred ninety-four million, five hundred fifty-six thousand, six hundred sixty-one".