665612843 has 16 divisors (see below), whose sum is σ = 789048000. Its totient is φ = 549370752.

The previous prime is 665612833. The next prime is 665612861. The reversal of 665612843 is 348216566.

It is not a de Polignac number, because 665612843 - 2⁸ = 665612587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665612843.

It is not an unprimeable number, because it can be changed into a prime (665612833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74753 + ... + 83181.

It is an arithmetic number, because the mean of its divisors is an integer number (49315500).

Almost surely, 2^665612843 is an apocalyptic number.

665612843 is a deficient number, since it is larger than the sum of its proper divisors (123435157).

665612843 is a wasteful number, since it uses less digits than its factorization.

665612843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8854.

The product of its digits is 207360, while the sum is 41.

The square root of 665612843 is about 25799.4736961823. The cubic root of 665612843 is about 873.1199221014.

The spelling of 665612843 in words is "six hundred sixty-five million, six hundred twelve thousand, eight hundred forty-three".