665611433 has 4 divisors (see below), whose sum is σ = 675546000. Its totient is φ = 655676868.

The previous prime is 665611423. The next prime is 665611469. The reversal of 665611433 is 334116566.

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 a de Polignac number, because none of the positive numbers 2^k-665611433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665611393 and 665611402.

It is not an unprimeable number, because it can be changed into a prime (665611403) 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, 4967183 + ... + 4967316.

It is an arithmetic number, because the mean of its divisors is an integer number (168886500).

Almost surely, 2^665611433 is an apocalyptic number.

It is an amenable number.

665611433 is a deficient number, since it is larger than the sum of its proper divisors (9934567).

665611433 is an equidigital number, since it uses as much as digits as its factorization.

665611433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9934566.

The product of its digits is 38880, while the sum is 35.

The square root of 665611433 is about 25799.4463700290. The cubic root of 665611433 is about 873.1193055768.

Adding to 665611433 its reverse (334116566), we get a palindrome (999727999).

The spelling of 665611433 in words is "six hundred sixty-five million, six hundred eleven thousand, four hundred thirty-three".