194955665 has 4 divisors (see below), whose sum is σ = 233946804. Its totient is φ = 155964528.

The previous prime is 194955617. The next prime is 194955703. The reversal of 194955665 is 566559491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566559491 = 283 ⋅2001977.

It can be written as a sum of positive squares in 2 ways, for example, as 25331089 + 169624576 = 5033^2 + 13024^2 .

It is a cyclic number.

It is not a de Polignac number, because 194955665 - 2¹² = 194951569 is a prime.

It is a super-2 number, since 2×194955665² = 76015422631184450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19495562 + ... + 19495571.

It is an arithmetic number, because the mean of its divisors is an integer number (58486701).

Almost surely, 2^194955665 is an apocalyptic number.

It is an amenable number.

194955665 is a deficient number, since it is larger than the sum of its proper divisors (38991139).

194955665 is an equidigital number, since it uses as much as digits as its factorization.

194955665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38991138.

The product of its digits is 1458000, while the sum is 50.

The square root of 194955665 is about 13962.6525058815. The cubic root of 194955665 is about 579.8450487778.

The spelling of 194955665 in words is "one hundred ninety-four million, nine hundred fifty-five thousand, six hundred sixty-five".