12516977197 has 4 divisors (see below), whose sum is σ = 12855273916. Its totient is φ = 12178680480.

The previous prime is 12516977119. The next prime is 12516977203. The reversal of 12516977197 is 79177961521.

12516977197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79177961521 = 31 ⋅2554127791.

It can be written as a sum of positive squares in 2 ways, for example, as 11808299556 + 708677641 = 108666^2 + 26621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12516977197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12516977797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169148304 + ... + 169148377.

It is an arithmetic number, because the mean of its divisors is an integer number (3213818479).

Almost surely, 2^12516977197 is an apocalyptic number.

It is an amenable number.

12516977197 is a deficient number, since it is larger than the sum of its proper divisors (338296719).

12516977197 is an equidigital number, since it uses as much as digits as its factorization.

12516977197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338296718.

The product of its digits is 1666980, while the sum is 55.

The spelling of 12516977197 in words is "twelve billion, five hundred sixteen million, nine hundred seventy-seven thousand, one hundred ninety-seven".