665140001 has 4 divisors (see below), whose sum is σ = 665267904. Its totient is φ = 665012100.

The previous prime is 665139991. The next prime is 665140031. The reversal of 665140001 is 100041566.

665140001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 665140001 - 2¹⁰ = 665138977 is a prime.

It is a super-2 number, since 2×665140001² = 884822441860560002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665140031) 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, 55805 + ... + 66666.

It is an arithmetic number, because the mean of its divisors is an integer number (166316976).

Almost surely, 2^665140001 is an apocalyptic number.

It is an amenable number.

665140001 is a deficient number, since it is larger than the sum of its proper divisors (127903).

665140001 is a wasteful number, since it uses less digits than its factorization.

665140001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127902.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 665140001 is about 25790.3082765600. The cubic root of 665140001 is about 872.9131224212.

Adding to 665140001 its reverse (100041566), we get a palindrome (765181567).

The spelling of 665140001 in words is "six hundred sixty-five million, one hundred forty thousand, one".