12746571081 has 4 divisors (see below), whose sum is σ = 16995428112. Its totient is φ = 8497714052.

The previous prime is 12746571067. The next prime is 12746571109. The reversal of 12746571081 is 18017564721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12746571081 - 2⁶ = 12746571017 is a prime.

It is a super-2 number, since 2×12746571081² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12746571581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2124428511 + ... + 2124428516.

It is an arithmetic number, because the mean of its divisors is an integer number (4248857028).

Almost surely, 2^12746571081 is an apocalyptic number.

It is an amenable number.

12746571081 is a deficient number, since it is larger than the sum of its proper divisors (4248857031).

12746571081 is an equidigital number, since it uses as much as digits as its factorization.

12746571081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248857030.

The product of its (nonzero) digits is 94080, while the sum is 42.

The spelling of 12746571081 in words is "twelve billion, seven hundred forty-six million, five hundred seventy-one thousand, eighty-one".