12936870578 has 4 divisors (see below), whose sum is σ = 19405305870. Its totient is φ = 6468435288.

The previous prime is 12936870577. The next prime is 12936870581. The reversal of 12936870578 is 87507863921.

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

It can be written as a sum of positive squares in only one way, i.e., 11102204689 + 1834665889 = 105367^2 + 42833^2 .

It is not an unprimeable number, because it can be changed into a prime (12936870577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3234217643 + ... + 3234217646.

Almost surely, 2^12936870578 is an apocalyptic number.

12936870578 is a deficient number, since it is larger than the sum of its proper divisors (6468435292).

12936870578 is an equidigital number, since it uses as much as digits as its factorization.

12936870578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6468435291.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 12936870578 in words is "twelve billion, nine hundred thirty-six million, eight hundred seventy thousand, five hundred seventy-eight".