665942073 has 8 divisors (see below), whose sum is σ = 888175200. Its totient is φ = 443835168.

The previous prime is 665942047. The next prime is 665942087. The reversal of 665942073 is 370249566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665942073 - 2⁵ = 665942041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665942273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18468 + ... + 40901.

It is an arithmetic number, because the mean of its divisors is an integer number (111021900).

Almost surely, 2^665942073 is an apocalyptic number.

It is an amenable number.

665942073 is a deficient number, since it is larger than the sum of its proper divisors (222233127).

665942073 is a wasteful number, since it uses less digits than its factorization.

665942073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63111.

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 665942073 is about 25805.8534638946. The cubic root of 665942073 is about 873.2638545657.

The spelling of 665942073 in words is "six hundred sixty-five million, nine hundred forty-two thousand, seventy-three".