12947819506 has 4 divisors (see below), whose sum is σ = 19421729262. Its totient is φ = 6473909752.

The previous prime is 12947819501. The next prime is 12947819509. The reversal of 12947819506 is 60591874921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60591874921 = 57947 ⋅1045643.

It can be written as a sum of positive squares in only one way, i.e., 12890196225 + 57623281 = 113535^2 + 7591^2 .

It is not an unprimeable number, because it can be changed into a prime (12947819501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3236954875 + ... + 3236954878.

Almost surely, 2^12947819506 is an apocalyptic number.

12947819506 is a deficient number, since it is larger than the sum of its proper divisors (6473909756).

12947819506 is an equidigital number, since it uses as much as digits as its factorization.

12947819506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6473909755.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 12947819506 in words is "twelve billion, nine hundred forty-seven million, eight hundred nineteen thousand, five hundred six".