12651166605 has 32 divisors (see below), whose sum is σ = 25236615168. Its totient is φ = 5257627200.

The previous prime is 12651166559. The next prime is 12651166609. The reversal of 12651166605 is 50666115621.

It is not a de Polignac number, because 12651166605 - 2¹² = 12651162509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12651166609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5475541 + ... + 5477850.

It is an arithmetic number, because the mean of its divisors is an integer number (788644224).

Almost surely, 2^12651166605 is an apocalyptic number.

12651166605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12651166605 is a deficient number, since it is larger than the sum of its proper divisors (12585448563).

12651166605 is a wasteful number, since it uses less digits than its factorization.

12651166605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10953417.

The product of its (nonzero) digits is 64800, while the sum is 39.

It can be divided in two parts, 1265116 and 6605, that added together give a palindrome (1271721).

The spelling of 12651166605 in words is "twelve billion, six hundred fifty-one million, one hundred sixty-six thousand, six hundred five".