638436307459 has 6 divisors (see below), whose sum is σ = 644820054980. Its totient is φ = 632115145800.

The previous prime is 638436307403. The next prime is 638436307471. The reversal of 638436307459 is 954703634836.

It is not a de Polignac number, because 638436307459 - 2⁹ = 638436306947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638436308459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31282629 + ... + 31303030.

Almost surely, 2^638436307459 is an apocalyptic number.

638436307459 is a deficient number, since it is larger than the sum of its proper divisors (6383747521).

638436307459 is an equidigital number, since it uses as much as digits as its factorization.

638436307459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62585861 (or 62585760 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 58.

The spelling of 638436307459 in words is "six hundred thirty-eight billion, four hundred thirty-six million, three hundred seven thousand, four hundred fifty-nine".