12639601789 has 2 divisors, whose sum is σ = 12639601790. Its totient is φ = 12639601788.

The previous prime is 12639601771. The next prime is 12639601817. The reversal of 12639601789 is 98710693621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6761772900 + 5877828889 = 82230^2 + 76667^2 .

It is a cyclic number.

It is not a de Polignac number, because 12639601789 - 2¹¹ = 12639599741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12639601189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319800894 + 6319800895.

It is an arithmetic number, because the mean of its divisors is an integer number (6319800895).

Almost surely, 2^12639601789 is an apocalyptic number.

It is an amenable number.

12639601789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12639601789 is an equidigital number, since it uses as much as digits as its factorization.

12639601789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 12639601789 in words is "twelve billion, six hundred thirty-nine million, six hundred one thousand, seven hundred eighty-nine".