12689085812 has 18 divisors (see below), whose sum is σ = 24045443478. Its totient is φ = 5856500832.

The previous prime is 12689085769. The next prime is 12689085823. The reversal of 12689085812 is 21858098621.

It can be written as a sum of positive squares in 3 ways, for example, as 411116176 + 12277969636 = 20276^2 + 110806^2 .

It is a super-2 number, since 2×12689085812² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9384743 + ... + 9386094.

It is an arithmetic number, because the mean of its divisors is an integer number (1335857971).

Almost surely, 2^12689085812 is an apocalyptic number.

It is an amenable number.

12689085812 is a deficient number, since it is larger than the sum of its proper divisors (11356357666).

12689085812 is a wasteful number, since it uses less digits than its factorization.

12689085812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18770867 (or 18770852 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 12689085812 in words is "twelve billion, six hundred eighty-nine million, eighty-five thousand, eight hundred twelve".