665555523 has 16 divisors (see below), whose sum is σ = 916893696. Its totient is φ = 428987520.

The previous prime is 665555521. The next prime is 665555537. The reversal of 665555523 is 325555566.

665555523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665555523 - 2¹ = 665555521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665555521) 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, 120715 + ... + 126107.

It is an arithmetic number, because the mean of its divisors is an integer number (57305856).

Almost surely, 2^665555523 is an apocalyptic number.

665555523 is a deficient number, since it is larger than the sum of its proper divisors (251338173).

665555523 is a wasteful number, since it uses less digits than its factorization.

665555523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6754.

The product of its digits is 675000, while the sum is 42.

The square root of 665555523 is about 25798.3627968908. The cubic root of 665555523 is about 873.0948581466.

The spelling of 665555523 in words is "six hundred sixty-five million, five hundred fifty-five thousand, five hundred twenty-three".