12640330827 has 10 divisors (see below), whose sum is σ = 18882469628. Its totient is φ = 8426887164.

The previous prime is 12640330799. The next prime is 12640330847. The reversal of 12640330827 is 72803304621.

It is a happy number.

12640330827 is a `hidden beast` number, since 1 + 2 + 640 + 3 + 3 + 0 + 8 + 2 + 7 = 666.

It is not a de Polignac number, because 12640330827 - 2⁶ = 12640330763 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12640330791 and 12640330800.

It is not an unprimeable number, because it can be changed into a prime (12640330847) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 78026653 + ... + 78026814.

Almost surely, 2^12640330827 is an apocalyptic number.

12640330827 is a deficient number, since it is larger than the sum of its proper divisors (6242138801).

12640330827 is an equidigital number, since it uses as much as digits as its factorization.

12640330827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156053479 (or 156053470 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 12640330827 in words is "twelve billion, six hundred forty million, three hundred thirty thousand, eight hundred twenty-seven".