12643615002640 has 40 divisors (see below), whose sum is σ = 29397844131840. Its totient is φ = 5057198388096.

The previous prime is 12643615002619. The next prime is 12643615002647. The reversal of 12643615002640 is 4620051634621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×12643615002640² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 12643615002593 and 12643615002602.

It is not an unprimeable number, because it can be changed into a prime (12643615002647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2220394 + ... + 5497033.

It is an arithmetic number, because the mean of its divisors is an integer number (734946103296).

Almost surely, 2^{12643615002640} is an apocalyptic number.

12643615002640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643615002640 is an abundant number, since it is smaller than the sum of its proper divisors (16754229129200).

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

12643615002640 is a wasteful number, since it uses less digits than its factorization.

12643615002640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7737919 (or 7737913 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 12643615002640 in words is "twelve trillion, six hundred forty-three billion, six hundred fifteen million, two thousand, six hundred forty".