665072918 has 4 divisors (see below), whose sum is σ = 997609380. Its totient is φ = 332536458.

The previous prime is 665072917. The next prime is 665072927. The reversal of 665072918 is 819270566.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665072917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166268228 + ... + 166268231.

It is an arithmetic number, because the mean of its divisors is an integer number (249402345).

Almost surely, 2^665072918 is an apocalyptic number.

665072918 is a deficient number, since it is larger than the sum of its proper divisors (332536462).

665072918 is a wasteful number, since it uses less digits than its factorization.

665072918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332536461.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 665072918 is about 25789.0076970790. The cubic root of 665072918 is about 872.8837754167.

The spelling of 665072918 in words is "six hundred sixty-five million, seventy-two thousand, nine hundred eighteen".