665854487 has 16 divisors (see below), whose sum is σ = 766080000. Its totient is φ = 574542720.

The previous prime is 665854477. The next prime is 665854489. The reversal of 665854487 is 784458566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 665854487 - 2²⁸ = 397419031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665854489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23237 + ... + 43262.

It is an arithmetic number, because the mean of its divisors is an integer number (47880000).

Almost surely, 2^665854487 is an apocalyptic number.

665854487 is a deficient number, since it is larger than the sum of its proper divisors (100225513).

665854487 is a wasteful number, since it uses less digits than its factorization.

665854487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66566.

The product of its digits is 6451200, while the sum is 53.

The square root of 665854487 is about 25804.1563900082. The cubic root of 665854487 is about 873.2255684321.

The spelling of 665854487 in words is "six hundred sixty-five million, eight hundred fifty-four thousand, four hundred eighty-seven".