663918171 has 16 divisors (see below), whose sum is σ = 1016826624. Its totient is φ = 377453664.

The previous prime is 663918113. The next prime is 663918179. The reversal of 663918171 is 171819366.

It is not a de Polignac number, because 663918171 - 2⁶ = 663918107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663918179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76105 + ... + 84378.

It is an arithmetic number, because the mean of its divisors is an integer number (63551664).

Almost surely, 2^663918171 is an apocalyptic number.

663918171 is a deficient number, since it is larger than the sum of its proper divisors (352908453).

663918171 is a wasteful number, since it uses less digits than its factorization.

663918171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160690.

The product of its digits is 54432, while the sum is 42.

The square root of 663918171 is about 25766.6096139946. The cubic root of 663918171 is about 872.3782950796.

The spelling of 663918171 in words is "six hundred sixty-three million, nine hundred eighteen thousand, one hundred seventy-one".