1638619825573 has 2 divisors, whose sum is σ = 1638619825574. Its totient is φ = 1638619825572.

The previous prime is 1638619825561. The next prime is 1638619825607. The reversal of 1638619825573 is 3755289168361.

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., 1638443520289 + 176305284 = 1280017^2 + 13278^2 .

It is a cyclic number.

It is not a de Polignac number, because 1638619825573 - 2¹³ = 1638619817381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1638619825523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819309912786 + 819309912787.

It is an arithmetic number, because the mean of its divisors is an integer number (819309912787).

Almost surely, 2^{1638619825573} is an apocalyptic number.

It is an amenable number.

1638619825573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638619825573 is an equidigital number, since it uses as much as digits as its factorization.

1638619825573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65318400, while the sum is 64.

The spelling of 1638619825573 in words is "one trillion, six hundred thirty-eight billion, six hundred nineteen million, eight hundred twenty-five thousand, five hundred seventy-three".