12665212812 has 360 divisors, whose sum is σ = 41306496000. Its totient is φ = 3310943040.

The previous prime is 12665212799. The next prime is 12665212853. The reversal of 12665212812 is 21821256621.

12665212812 is a `hidden beast` number, since 126 + 6 + 521 + 2 + 8 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 25380939 + ... + 25381437.

Almost surely, 2^12665212812 is an apocalyptic number.

12665212812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12665212812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20653248000).

12665212812 is an abundant number, since it is smaller than the sum of its proper divisors (28641283188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12665212812 is a wasteful number, since it uses less digits than its factorization.

12665212812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 561 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The spelling of 12665212812 in words is "twelve billion, six hundred sixty-five million, two hundred twelve thousand, eight hundred twelve".