10666378565 has 16 divisors (see below), whose sum is σ = 13015297920. Its totient is φ = 8389465920.

The previous prime is 10666378549. The next prime is 10666378579. The reversal of 10666378565 is 56587366601.

It is not a de Polignac number, because 10666378565 - 2⁴ = 10666378549 is a prime.

It is a super-2 number, since 2×10666378565² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 819176 + ... + 832094.

It is an arithmetic number, because the mean of its divisors is an integer number (813456120).

Almost surely, 2^10666378565 is an apocalyptic number.

It is an amenable number.

10666378565 is a deficient number, since it is larger than the sum of its proper divisors (2348919355).

10666378565 is a wasteful number, since it uses less digits than its factorization.

10666378565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15692.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 10666378565 in words is "ten billion, six hundred sixty-six million, three hundred seventy-eight thousand, five hundred sixty-five".