12641640534 has 48 divisors (see below), whose sum is σ = 28180035312. Its totient is φ = 4094095104.

The previous prime is 12641640509. The next prime is 12641640541. The reversal of 12641640534 is 43504614621.

12641640534 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 1 + 640 + 5 + 3 + 4 = 666.

It is a super-2 number, since 2×12641640534² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16242 + ... + 159834.

It is an arithmetic number, because the mean of its divisors is an integer number (587084069).

Almost surely, 2^12641640534 is an apocalyptic number.

12641640534 is an abundant number, since it is smaller than the sum of its proper divisors (15538394778).

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

12641640534 is a wasteful number, since it uses less digits than its factorization.

12641640534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143741 (or 143738 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 12641640534 in words is "twelve billion, six hundred forty-one million, six hundred forty thousand, five hundred thirty-four".