12666573405 has 12 divisors (see below), whose sum is σ = 21955393980. Its totient is φ = 6755505792.

The previous prime is 12666573391. The next prime is 12666573427. The reversal of 12666573405 is 50437566621.

It can be written as a sum of positive squares in 2 ways, for example, as 9074848644 + 3591724761 = 95262^2 + 59931^2 .

It is not a de Polignac number, because 12666573405 - 2⁵ = 12666573373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 281479409 = 12666573405 / (1 + 2 + 6 + 6 + 6 + 5 + 7 + 3 + 4 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140739660 + ... + 140739749.

It is an arithmetic number, because the mean of its divisors is an integer number (1829616165).

Almost surely, 2^12666573405 is an apocalyptic number.

12666573405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12666573405 is a deficient number, since it is larger than the sum of its proper divisors (9288820575).

12666573405 is a wasteful number, since it uses less digits than its factorization.

12666573405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281479420 (or 281479417 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 12666573405 in words is "twelve billion, six hundred sixty-six million, five hundred seventy-three thousand, four hundred five".