638586471403 has 2 divisors, whose sum is σ = 638586471404. Its totient is φ = 638586471402.

The previous prime is 638586471389. The next prime is 638586471421. The reversal of 638586471403 is 304174685836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638586471403 - 2⁵ = 638586471371 is a prime.

It is not a weakly prime, because it can be changed into another prime (638586471433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319293235701 + 319293235702.

It is an arithmetic number, because the mean of its divisors is an integer number (319293235702).

Almost surely, 2^638586471403 is an apocalyptic number.

638586471403 is a deficient number, since it is larger than the sum of its proper divisors (1).

638586471403 is an equidigital number, since it uses as much as digits as its factorization.

638586471403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 55.

The spelling of 638586471403 in words is "six hundred thirty-eight billion, five hundred eighty-six million, four hundred seventy-one thousand, four hundred three".