12817404665 has 16 divisors (see below), whose sum is σ = 16581066768. Its totient is φ = 9455425536.

The previous prime is 12817404653. The next prime is 12817404667. The reversal of 12817404665 is 56640471821.

It can be written as a sum of positive squares in 8 ways, for example, as 1603441849 + 11213962816 = 40043^2 + 105896^2 .

It is a cyclic number.

It is not a de Polignac number, because 12817404665 - 2¹⁴ = 12817388281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12817404667) 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, 37412 + ... + 164421.

It is an arithmetic number, because the mean of its divisors is an integer number (1036316673).

Almost surely, 2^12817404665 is an apocalyptic number.

It is an amenable number.

12817404665 is a deficient number, since it is larger than the sum of its proper divisors (3763662103).

12817404665 is a wasteful number, since it uses less digits than its factorization.

12817404665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202828.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 12817404665 in words is "twelve billion, eight hundred seventeen million, four hundred four thousand, six hundred sixty-five".