665601443 has 4 divisors (see below), whose sum is σ = 716801568. Its totient is φ = 614401320.

The previous prime is 665601367. The next prime is 665601449. The reversal of 665601443 is 344106566.

665601443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 665601443 - 2¹⁸ = 665339299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665601449) 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, 25600043 + ... + 25600068.

It is an arithmetic number, because the mean of its divisors is an integer number (179200392).

Almost surely, 2^665601443 is an apocalyptic number.

665601443 is a deficient number, since it is larger than the sum of its proper divisors (51200125).

665601443 is a wasteful number, since it uses less digits than its factorization.

665601443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51200124.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 665601443 is about 25799.2527604968. The cubic root of 665601443 is about 873.1149374099.

The spelling of 665601443 in words is "six hundred sixty-five million, six hundred one thousand, four hundred forty-three".