665143001 has 2 divisors, whose sum is σ = 665143002. Its totient is φ = 665143000.

The previous prime is 665142979. The next prime is 665143007. The reversal of 665143001 is 100341566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531763600 + 133379401 = 23060^2 + 11549^2 .

It is a cyclic number.

It is not a de Polignac number, because 665143001 - 2²² = 660948697 is a prime.

It is not a weakly prime, because it can be changed into another prime (665143007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332571500 + 332571501.

It is an arithmetic number, because the mean of its divisors is an integer number (332571501).

Almost surely, 2^665143001 is an apocalyptic number.

It is an amenable number.

665143001 is a deficient number, since it is larger than the sum of its proper divisors (1).

665143001 is an equidigital number, since it uses as much as digits as its factorization.

665143001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 665143001 is about 25790.3664378775. The cubic root of 665143001 is about 872.9144347942.

Adding to 665143001 its reverse (100341566), we get a palindrome (765484567).

The spelling of 665143001 in words is "six hundred sixty-five million, one hundred forty-three thousand, one".