665744073 has 8 divisors (see below), whose sum is σ = 887916000. Its totient is φ = 443700768.

The previous prime is 665744047. The next prime is 665744099. The reversal of 665744073 is 370447566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665744047) and next prime (665744099).

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

It is not a de Polignac number, because 665744073 - 2⁵ = 665744041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665744273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19348 + ... + 41301.

It is an arithmetic number, because the mean of its divisors is an integer number (110989500).

Almost surely, 2^665744073 is an apocalyptic number.

It is an amenable number.

665744073 is a deficient number, since it is larger than the sum of its proper divisors (222171927).

665744073 is a wasteful number, since it uses less digits than its factorization.

665744073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64311.

The product of its (nonzero) digits is 423360, while the sum is 42.

The square root of 665744073 is about 25802.0168397744. The cubic root of 665744073 is about 873.1772987978.

The spelling of 665744073 in words is "six hundred sixty-five million, seven hundred forty-four thousand, seventy-three".