12651334920 has 640 divisors, whose sum is σ = 51519283200. Its totient is φ = 2722097664.

The previous prime is 12651334919. The next prime is 12651334939. The reversal of 12651334920 is 2943315621.

12651334920 is a `hidden beast` number, since 1 + 26 + 513 + 34 + 92 + 0 = 666.

It is a super-2 number, since 2×12651334920² (a number of 21 digits) contains 22 as substring.

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 159 ways as a sum of consecutive naturals, for example, 41209407 + ... + 41209713.

It is an arithmetic number, because the mean of its divisors is an integer number (80498880).

Almost surely, 2^12651334920 is an apocalyptic number.

12651334920 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 12651334920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25759641600).

12651334920 is an abundant number, since it is smaller than the sum of its proper divisors (38867948280).

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

12651334920 is a wasteful number, since it uses less digits than its factorization.

12651334920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 12651334920 in words is "twelve billion, six hundred fifty-one million, three hundred thirty-four thousand, nine hundred twenty".