12663787662640 has 80 divisors (see below), whose sum is σ = 30401817302016. Its totient is φ = 4900703788800.

The previous prime is 12663787662637. The next prime is 12663787662677. The reversal of 12663787662640 is 4626678736621.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7926319 + ... + 9389041.

Almost surely, 2^{12663787662640} is an apocalyptic number.

12663787662640 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 12663787662640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15200908651008).

12663787662640 is an abundant number, since it is smaller than the sum of its proper divisors (17738029639376).

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

12663787662640 is a wasteful number, since it uses less digits than its factorization.

12663787662640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466258 (or 1466252 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 64.

The spelling of 12663787662640 in words is "twelve trillion, six hundred sixty-three billion, seven hundred eighty-seven million, six hundred sixty-two thousand, six hundred forty".