12657143557 has 4 divisors (see below), whose sum is σ = 12999228556. Its totient is φ = 12315058560.

The previous prime is 12657143507. The next prime is 12657143581. The reversal of 12657143557 is 75534175621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8931384036 + 3725759521 = 94506^2 + 61039^2 .

It is a cyclic number.

It is not a de Polignac number, because 12657143557 - 2¹¹ = 12657141509 is a prime.

It is a super-2 number, since 2×12657143557² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12657143507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171042444 + ... + 171042517.

It is an arithmetic number, because the mean of its divisors is an integer number (3249807139).

Almost surely, 2^12657143557 is an apocalyptic number.

It is an amenable number.

12657143557 is a deficient number, since it is larger than the sum of its proper divisors (342084999).

12657143557 is an equidigital number, since it uses as much as digits as its factorization.

12657143557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342084998.

The product of its digits is 882000, while the sum is 46.

The spelling of 12657143557 in words is "twelve billion, six hundred fifty-seven million, one hundred forty-three thousand, five hundred fifty-seven".