665063643 has 4 divisors (see below), whose sum is σ = 886751528. Its totient is φ = 443375760.

The previous prime is 665063629. The next prime is 665063657. The reversal of 665063643 is 346360566.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (665063629) and next prime (665063657).

It is not a de Polignac number, because 665063643 - 2⁵ = 665063611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665063143) 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, 110843938 + ... + 110843943.

It is an arithmetic number, because the mean of its divisors is an integer number (221687882).

Almost surely, 2^665063643 is an apocalyptic number.

665063643 is a deficient number, since it is larger than the sum of its proper divisors (221687885).

665063643 is a wasteful number, since it uses less digits than its factorization.

665063643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221687884.

The product of its (nonzero) digits is 233280, while the sum is 39.

The square root of 665063643 is about 25788.8278717742. The cubic root of 665063643 is about 872.8797176989.

The spelling of 665063643 in words is "six hundred sixty-five million, sixty-three thousand, six hundred forty-three".