665506043 has 4 divisors (see below), whose sum is σ = 665619600. Its totient is φ = 665392488.

The previous prime is 665506031. The next prime is 665506111. The reversal of 665506043 is 340605566.

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

It is a cyclic number.

It is not a de Polignac number, because 665506043 - 2⁶ = 665505979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665505994 and 665506012.

It is not an unprimeable number, because it can be changed into a prime (665506003) 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, 47480 + ... + 59877.

It is an arithmetic number, because the mean of its divisors is an integer number (166404900).

Almost surely, 2^665506043 is an apocalyptic number.

665506043 is a deficient number, since it is larger than the sum of its proper divisors (113557).

665506043 is a wasteful number, since it uses less digits than its factorization.

665506043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113556.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 665506043 is about 25797.4038034838. The cubic root of 665506043 is about 873.0732211818.

The spelling of 665506043 in words is "six hundred sixty-five million, five hundred six thousand, forty-three".