663211617 has 4 divisors (see below), whose sum is σ = 884282160. Its totient is φ = 442141076.

The previous prime is 663211607. The next prime is 663211621. The reversal of 663211617 is 716112366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663211617 - 2⁶ = 663211553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663211607) 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, 110535267 + ... + 110535272.

It is an arithmetic number, because the mean of its divisors is an integer number (221070540).

Almost surely, 2^663211617 is an apocalyptic number.

It is an amenable number.

663211617 is a deficient number, since it is larger than the sum of its proper divisors (221070543).

663211617 is a wasteful number, since it uses less digits than its factorization.

663211617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221070542.

The product of its digits is 9072, while the sum is 33.

The square root of 663211617 is about 25752.8953129546. The cubic root of 663211617 is about 872.0687181943.

The spelling of 663211617 in words is "six hundred sixty-three million, two hundred eleven thousand, six hundred seventeen".