12911543432640 has 448 divisors, whose sum is σ = 45939175096320. Its totient is φ = 3413626675200.

The previous prime is 12911543432617. The next prime is 12911543432651. The reversal of 12911543432640 is 4623434511921.

It is a happy number.

12911543432640 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 1 + 543 + 43 + 2 + 64 + 0 = 666.

It is a super-2 number, since 2×12911543432640² (a number of 27 digits) contains 22 as substring.

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 polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2099093565 + ... + 2099099715.

Almost surely, 2^{12911543432640} is an apocalyptic number.

12911543432640 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 12911543432640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22969587548160).

12911543432640 is an abundant number, since it is smaller than the sum of its proper divisors (33027631663680).

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

12911543432640 is a wasteful number, since it uses less digits than its factorization.

12911543432640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8217 (or 8201 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 12911543432640 in words is "twelve trillion, nine hundred eleven billion, five hundred forty-three million, four hundred thirty-two thousand, six hundred forty".