12665933280 has 1536 divisors, whose sum is σ = 62183116800. Its totient is φ = 2322432000.

The previous prime is 12665933279. The next prime is 12665933299. The reversal of 12665933280 is 8233956621.

12665933280 is a `hidden beast` number, since 1 + 26 + 6 + 593 + 32 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 125405230 + ... + 125405330.

It is an arithmetic number, because the mean of its divisors is an integer number (40483800).

Almost surely, 2^12665933280 is an apocalyptic number.

12665933280 is a gapful number since it is divisible by the number (10) 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 12665933280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31091558400).

12665933280 is an abundant number, since it is smaller than the sum of its proper divisors (49517183520).

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

12665933280 is a wasteful number, since it uses less digits than its factorization.

12665933280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 12665933280 in words is "twelve billion, six hundred sixty-five million, nine hundred thirty-three thousand, two hundred eighty".