665606323033 has 4 divisors (see below), whose sum is σ = 672068520448. Its totient is φ = 659144125620.

The previous prime is 665606322991. The next prime is 665606323043. The reversal of 665606323033 is 330323606566.

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-665606323033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665606323043) 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, 3231098553 + ... + 3231098758.

It is an arithmetic number, because the mean of its divisors is an integer number (168017130112).

Almost surely, 2^665606323033 is an apocalyptic number.

It is an amenable number.

665606323033 is a deficient number, since it is larger than the sum of its proper divisors (6462197415).

665606323033 is a wasteful number, since it uses less digits than its factorization.

665606323033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462197414.

The product of its (nonzero) digits is 1049760, while the sum is 43.

Adding to 665606323033 its reverse (330323606566), we get a palindrome (995929929599).

The spelling of 665606323033 in words is "six hundred sixty-five billion, six hundred six million, three hundred twenty-three thousand, thirty-three".