665152045186 has 4 divisors (see below), whose sum is σ = 997728067782. Its totient is φ = 332576022592.

The previous prime is 665152045183. The next prime is 665152045193. The reversal of 665152045186 is 681540251566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 681540251566 = 2 ⋅340770125783.

It can be written as a sum of positive squares in only one way, i.e., 578322225625 + 86829819561 = 760475^2 + 294669^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (665152045183) 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 as a sum of consecutive naturals, namely, 166288011295 + ... + 166288011298.

Almost surely, 2^665152045186 is an apocalyptic number.

665152045186 is a deficient number, since it is larger than the sum of its proper divisors (332576022596).

665152045186 is a wasteful number, since it uses less digits than its factorization.

665152045186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332576022595.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 665152045186 in words is "six hundred sixty-five billion, one hundred fifty-two million, forty-five thousand, one hundred eighty-six".