638762512543 has 2 divisors, whose sum is σ = 638762512544. Its totient is φ = 638762512542.

The previous prime is 638762512523. The next prime is 638762512637. The reversal of 638762512543 is 345215267836.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638762512543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638762512523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319381256271 + 319381256272.

It is an arithmetic number, because the mean of its divisors is an integer number (319381256272).

Almost surely, 2^638762512543 is an apocalyptic number.

638762512543 is a deficient number, since it is larger than the sum of its proper divisors (1).

638762512543 is an equidigital number, since it uses as much as digits as its factorization.

638762512543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 52.

The spelling of 638762512543 in words is "six hundred thirty-eight billion, seven hundred sixty-two million, five hundred twelve thousand, five hundred forty-three".