663117871 has 4 divisors (see below), whose sum is σ = 714126952. Its totient is φ = 612108792.

The previous prime is 663117809. The next prime is 663117881. The reversal of 663117871 is 178711366.

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 663117871 - 2⁹ = 663117359 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 (663117881) 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, 25504521 + ... + 25504546.

It is an arithmetic number, because the mean of its divisors is an integer number (178531738).

Almost surely, 2^663117871 is an apocalyptic number.

663117871 is a deficient number, since it is larger than the sum of its proper divisors (51009081).

663117871 is a wasteful number, since it uses less digits than its factorization.

663117871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51009080.

The product of its digits is 42336, while the sum is 40.

The square root of 663117871 is about 25751.0751426033. The cubic root of 663117871 is about 872.0276268321.

The spelling of 663117871 in words is "six hundred sixty-three million, one hundred seventeen thousand, eight hundred seventy-one".