663682161 has 4 divisors (see below), whose sum is σ = 884909552. Its totient is φ = 442454772.

The previous prime is 663682153. The next prime is 663682163. The reversal of 663682161 is 161286366.

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 not a de Polignac number, because 663682161 - 2³ = 663682153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663682163) 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, 110613691 + ... + 110613696.

It is an arithmetic number, because the mean of its divisors is an integer number (221227388).

Almost surely, 2^663682161 is an apocalyptic number.

It is an amenable number.

663682161 is a deficient number, since it is larger than the sum of its proper divisors (221227391).

663682161 is a wasteful number, since it uses less digits than its factorization.

663682161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221227390.

The product of its digits is 62208, while the sum is 39.

The square root of 663682161 is about 25762.0294425730. The cubic root of 663682161 is about 872.2749116549.

The spelling of 663682161 in words is "six hundred sixty-three million, six hundred eighty-two thousand, one hundred sixty-one".