665180023 has 4 divisors (see below), whose sum is σ = 681403968. Its totient is φ = 648956080.

The previous prime is 665179997. The next prime is 665180039. The reversal of 665180023 is 320081566.

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

It is a cyclic number.

It is not a de Polignac number, because 665180023 - 2¹³ = 665171831 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665180093) 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, 8111911 + ... + 8111992.

It is an arithmetic number, because the mean of its divisors is an integer number (170350992).

Almost surely, 2^665180023 is an apocalyptic number.

665180023 is a deficient number, since it is larger than the sum of its proper divisors (16223945).

665180023 is a wasteful number, since it uses less digits than its factorization.

665180023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16223944.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 665180023 is about 25791.0841765134. The cubic root of 665180023 is about 872.9306300277.

The spelling of 665180023 in words is "six hundred sixty-five million, one hundred eighty thousand, twenty-three".