665615558413 has 16 divisors (see below), whose sum is σ = 747326321280. Its totient is φ = 588802503744.

The previous prime is 665615558393. The next prime is 665615558417. The reversal of 665615558413 is 314855516566.

It is not a de Polignac number, because 665615558413 - 2¹³ = 665615550221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665615558417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11203633 + ... + 11262886.

It is an arithmetic number, because the mean of its divisors is an integer number (46707895080).

Almost surely, 2^665615558413 is an apocalyptic number.

It is an amenable number.

665615558413 is a deficient number, since it is larger than the sum of its proper divisors (81710762867).

665615558413 is a wasteful number, since it uses less digits than its factorization.

665615558413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22466628.

The product of its digits is 12960000, while the sum is 55.

The spelling of 665615558413 in words is "six hundred sixty-five billion, six hundred fifteen million, five hundred fifty-eight thousand, four hundred thirteen".