12746166321 has 32 divisors (see below), whose sum is σ = 20452556800. Its totient is φ = 6897623040.

The previous prime is 12746166271. The next prime is 12746166379. The reversal of 12746166321 is 12366164721.

It is a happy number.

It is not a de Polignac number, because 12746166321 - 2¹³ = 12746158129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12746166321.

It is not an unprimeable number, because it can be changed into a prime (12746166221) 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, 1655601 + ... + 1663281.

It is an arithmetic number, because the mean of its divisors is an integer number (639142400).

Almost surely, 2^12746166321 is an apocalyptic number.

It is an amenable number.

12746166321 is a deficient number, since it is larger than the sum of its proper divisors (7706390479).

12746166321 is a wasteful number, since it uses less digits than its factorization.

12746166321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11869.

The product of its digits is 72576, while the sum is 39.

The spelling of 12746166321 in words is "twelve billion, seven hundred forty-six million, one hundred sixty-six thousand, three hundred twenty-one".