194545663 has 4 divisors (see below), whose sum is σ = 209510728. Its totient is φ = 179580600.

The previous prime is 194545649. The next prime is 194545691. The reversal of 194545663 is 366545491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366545491 = 13 ⋅28195807.

It is a cyclic number.

It is not a de Polignac number, because 194545663 - 2¹³ = 194537471 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 (194545633) 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, 7482513 + ... + 7482538.

It is an arithmetic number, because the mean of its divisors is an integer number (52377682).

Almost surely, 2^194545663 is an apocalyptic number.

194545663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

194545663 is a deficient number, since it is larger than the sum of its proper divisors (14965065).

194545663 is a wasteful number, since it uses less digits than its factorization.

194545663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14965064.

The product of its digits is 388800, while the sum is 43.

The square root of 194545663 is about 13947.9626827720. The cubic root of 194545663 is about 579.4382819659.

The spelling of 194545663 in words is "one hundred ninety-four million, five hundred forty-five thousand, six hundred sixty-three".