13143721057 has 8 divisors (see below), whose sum is σ = 13448860200. Its totient is φ = 12841474560.

The previous prime is 13143721009. The next prime is 13143721091. The reversal of 13143721057 is 75012734131.

It can be written as a sum of positive squares in 4 ways, for example, as 2759295841 + 10384425216 = 52529^2 + 101904^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13143721057 - 2¹⁹ = 13143196769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13143721007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713968 + ... + 732145.

It is an arithmetic number, because the mean of its divisors is an integer number (1681107525).

Almost surely, 2^13143721057 is an apocalyptic number.

It is an amenable number.

13143721057 is a deficient number, since it is larger than the sum of its proper divisors (305139143).

13143721057 is a wasteful number, since it uses less digits than its factorization.

13143721057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446323.

The product of its (nonzero) digits is 17640, while the sum is 34.

The spelling of 13143721057 in words is "thirteen billion, one hundred forty-three million, seven hundred twenty-one thousand, fifty-seven".