665111001 has 8 divisors (see below), whose sum is σ = 910782784. Its totient is φ = 431423280.

The previous prime is 665110993. The next prime is 665111021. The reversal of 665111001 is 100111566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665111001 - 2³ = 665110993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665111021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2995885 + ... + 2996106.

It is an arithmetic number, because the mean of its divisors is an integer number (113847848).

Almost surely, 2^665111001 is an apocalyptic number.

It is an amenable number.

665111001 is a deficient number, since it is larger than the sum of its proper divisors (245671783).

665111001 is a wasteful number, since it uses less digits than its factorization.

665111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5992031.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 665111001 is about 25789.7460437283. The cubic root of 665111001 is about 872.9004359449.

Adding to 665111001 its reverse (100111566), we get a palindrome (765222567).

The spelling of 665111001 in words is "six hundred sixty-five million, one hundred eleven thousand, one".