194145663 has 4 divisors (see below), whose sum is σ = 258860888. Its totient is φ = 129430440.

The previous prime is 194145649. The next prime is 194145671. The reversal of 194145663 is 366541491.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 194145663 - 2⁴ = 194145647 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 (194145613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32357608 + ... + 32357613.

It is an arithmetic number, because the mean of its divisors is an integer number (64715222).

Almost surely, 2^194145663 is an apocalyptic number.

194145663 is a deficient number, since it is larger than the sum of its proper divisors (64715225).

194145663 is an equidigital number, since it uses as much as digits as its factorization.

194145663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64715224.

The product of its digits is 77760, while the sum is 39.

The square root of 194145663 is about 13933.6162929801. The cubic root of 194145663 is about 579.0408870992.

The spelling of 194145663 in words is "one hundred ninety-four million, one hundred forty-five thousand, six hundred sixty-three".