12638220373 has 2 divisors, whose sum is σ = 12638220374. Its totient is φ = 12638220372.

The previous prime is 12638220347. The next prime is 12638220403. The reversal of 12638220373 is 37302283621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6998660964 + 5639559409 = 83658^2 + 75097^2 .

It is a cyclic number.

It is not a de Polignac number, because 12638220373 - 2⁵ = 12638220341 is a prime.

It is a super-2 number, since 2×12638220373² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638227373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319110186 + 6319110187.

It is an arithmetic number, because the mean of its divisors is an integer number (6319110187).

Almost surely, 2^12638220373 is an apocalyptic number.

It is an amenable number.

12638220373 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638220373 is an equidigital number, since it uses as much as digits as its factorization.

12638220373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The spelling of 12638220373 in words is "twelve billion, six hundred thirty-eight million, two hundred twenty thousand, three hundred seventy-three".