638654026327 has 2 divisors, whose sum is σ = 638654026328. Its totient is φ = 638654026326.

The previous prime is 638654026259. The next prime is 638654026379. The reversal of 638654026327 is 723620456836.

It is an a-pointer prime, because the next prime (638654026379) can be obtained adding 638654026327 to its sum of digits (52).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638654026327 - 2¹⁵ = 638653993559 is a prime.

It is a super-2 number, since 2×638654026327² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638654026627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319327013163 + 319327013164.

It is an arithmetic number, because the mean of its divisors is an integer number (319327013164).

Almost surely, 2^638654026327 is an apocalyptic number.

638654026327 is a deficient number, since it is larger than the sum of its proper divisors (1).

638654026327 is an equidigital number, since it uses as much as digits as its factorization.

638654026327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 52.

The spelling of 638654026327 in words is "six hundred thirty-eight billion, six hundred fifty-four million, twenty-six thousand, three hundred twenty-seven".