663374191 has 8 divisors (see below), whose sum is σ = 666715104. Its totient is φ = 660042240.

The previous prime is 663374167. The next prime is 663374197. The reversal of 663374191 is 191473366.

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 663374191 - 2⁹ = 663373679 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 (663374197) 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, 182110 + ... + 185716.

It is an arithmetic number, because the mean of its divisors is an integer number (83339388).

Almost surely, 2^663374191 is an apocalyptic number.

663374191 is a deficient number, since it is larger than the sum of its proper divisors (3340913).

663374191 is a wasteful number, since it uses less digits than its factorization.

663374191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481.

The product of its digits is 81648, while the sum is 40.

The square root of 663374191 is about 25756.0515413368. The cubic root of 663374191 is about 872.1399695180.

The spelling of 663374191 in words is "six hundred sixty-three million, three hundred seventy-four thousand, one hundred ninety-one".