12640138751 has 2 divisors, whose sum is σ = 12640138752. Its totient is φ = 12640138750.

The previous prime is 12640138723. The next prime is 12640138799. The reversal of 12640138751 is 15783104621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12640138751 - 2¹⁴ = 12640122367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12640128751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320069375 + 6320069376.

It is an arithmetic number, because the mean of its divisors is an integer number (6320069376).

Almost surely, 2^12640138751 is an apocalyptic number.

12640138751 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640138751 is an equidigital number, since it uses as much as digits as its factorization.

12640138751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 12640138751 in words is "twelve billion, six hundred forty million, one hundred thirty-eight thousand, seven hundred fifty-one".