638376673813 has 2 divisors, whose sum is σ = 638376673814. Its totient is φ = 638376673812.

The previous prime is 638376673789. The next prime is 638376673967. The reversal of 638376673813 is 318376673836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485834092324 + 152542581489 = 697018^2 + 390567^2 .

It is a cyclic number.

It is not a de Polignac number, because 638376673813 - 2¹³ = 638376665621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638376673013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319188336906 + 319188336907.

It is an arithmetic number, because the mean of its divisors is an integer number (319188336907).

Almost surely, 2^638376673813 is an apocalyptic number.

It is an amenable number.

638376673813 is a deficient number, since it is larger than the sum of its proper divisors (1).

638376673813 is an equidigital number, since it uses as much as digits as its factorization.

638376673813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 61.

The spelling of 638376673813 in words is "six hundred thirty-eight billion, three hundred seventy-six million, six hundred seventy-three thousand, eight hundred thirteen".