663116791 has 4 divisors (see below), whose sum is σ = 663480784. Its totient is φ = 662752800.

The previous prime is 663116759. The next prime is 663116851. The reversal of 663116791 is 197611366.

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

It is a cyclic number.

It is not a de Polignac number, because 663116791 - 2⁵ = 663116759 is a prime.

It is a super-2 number, since 2×663116791² = 879447757012275362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663116711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179250 + ... + 182911.

It is an arithmetic number, because the mean of its divisors is an integer number (165870196).

Almost surely, 2^663116791 is an apocalyptic number.

663116791 is a deficient number, since it is larger than the sum of its proper divisors (363993).

663116791 is a wasteful number, since it uses less digits than its factorization.

663116791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363992.

The product of its digits is 40824, while the sum is 40.

The square root of 663116791 is about 25751.0541725965. The cubic root of 663116791 is about 872.0271534169.

The spelling of 663116791 in words is "six hundred sixty-three million, one hundred sixteen thousand, seven hundred ninety-one".