12689575946 has 4 divisors (see below), whose sum is σ = 19034363922. Its totient is φ = 6344787972.

The previous prime is 12689575937. The next prime is 12689575949. The reversal of 12689575946 is 64957598621.

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., 10398900625 + 2290675321 = 101975^2 + 47861^2 .

It is a super-2 number, since 2×12689575946² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12689575949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3172393985 + ... + 3172393988.

Almost surely, 2^12689575946 is an apocalyptic number.

12689575946 is a deficient number, since it is larger than the sum of its proper divisors (6344787976).

12689575946 is an equidigital number, since it uses as much as digits as its factorization.

12689575946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6344787975.

The product of its digits is 32659200, while the sum is 62.

The spelling of 12689575946 in words is "twelve billion, six hundred eighty-nine million, five hundred seventy-five thousand, nine hundred forty-six".