12543158777 has 4 divisors (see below), whose sum is σ = 12543572580. Its totient is φ = 12542744976.

The previous prime is 12543158753. The next prime is 12543158783. The reversal of 12543158777 is 77785134521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77785134521 = 37 ⋅2102300933.

It can be written as a sum of positive squares in 2 ways, for example, as 2599878121 + 9943280656 = 50989^2 + 99716^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543158777 - 2⁸ = 12543158521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12543158707) 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, 157502 + ... + 223367.

It is an arithmetic number, because the mean of its divisors is an integer number (3135893145).

Almost surely, 2^12543158777 is an apocalyptic number.

It is an amenable number.

12543158777 is a deficient number, since it is larger than the sum of its proper divisors (413803).

12543158777 is an equidigital number, since it uses as much as digits as its factorization.

12543158777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413802.

The product of its digits is 1646400, while the sum is 50.

The spelling of 12543158777 in words is "twelve billion, five hundred forty-three million, one hundred fifty-eight thousand, seven hundred seventy-seven".