638263251323 has 2 divisors, whose sum is σ = 638263251324. Its totient is φ = 638263251322.

The previous prime is 638263251317. The next prime is 638263251337. The reversal of 638263251323 is 323152362836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638263251323 - 2¹⁰ = 638263250299 is a prime.

It is a super-3 number, since 3×638263251323³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (638263251523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319131625661 + 319131625662.

It is an arithmetic number, because the mean of its divisors is an integer number (319131625662).

Almost surely, 2^638263251323 is an apocalyptic number.

638263251323 is a deficient number, since it is larger than the sum of its proper divisors (1).

638263251323 is an equidigital number, since it uses as much as digits as its factorization.

638263251323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 44.

The spelling of 638263251323 in words is "six hundred thirty-eight billion, two hundred sixty-three million, two hundred fifty-one thousand, three hundred twenty-three".