665043620203 has 4 divisors (see below), whose sum is σ = 672516020520. Its totient is φ = 657571219888.

The previous prime is 665043620191. The next prime is 665043620221. The reversal of 665043620203 is 302026340566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665043620203 is a prime.

It is a super-2 number, since 2×665043620203² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665043620273) 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, 3736200025 + ... + 3736200202.

It is an arithmetic number, because the mean of its divisors is an integer number (168129005130).

Almost surely, 2^665043620203 is an apocalyptic number.

665043620203 is a deficient number, since it is larger than the sum of its proper divisors (7472400317).

665043620203 is an equidigital number, since it uses as much as digits as its factorization.

665043620203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7472400316.

The product of its (nonzero) digits is 155520, while the sum is 37.

Adding to 665043620203 its reverse (302026340566), we get a palindrome (967069960769).

The spelling of 665043620203 in words is "six hundred sixty-five billion, forty-three million, six hundred twenty thousand, two hundred three".