665078073 has 16 divisors (see below), whose sum is σ = 975387072. Its totient is φ = 403075200.

The previous prime is 665078069. The next prime is 665078101. The reversal of 665078073 is 370870566.

It is not a de Polignac number, because 665078073 - 2² = 665078069 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665078003) 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, 79288 + ... + 87273.

It is an arithmetic number, because the mean of its divisors is an integer number (60961692).

Almost surely, 2^665078073 is an apocalyptic number.

It is an amenable number.

665078073 is a deficient number, since it is larger than the sum of its proper divisors (310308999).

665078073 is a wasteful number, since it uses less digits than its factorization.

665078073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166597 (or 166575 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 665078073 is about 25789.1076425688. The cubic root of 665078073 is about 872.8860306603.

The spelling of 665078073 in words is "six hundred sixty-five million, seventy-eight thousand, seventy-three".