638919003499 has 16 divisors (see below), whose sum is σ = 733141994176. Its totient is φ = 545437411200.

The previous prime is 638919003467. The next prime is 638919003661. The reversal of 638919003499 is 994300919836.

It is a cyclic number.

It is not a de Polignac number, because 638919003499 - 2⁵ = 638919003467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638919004499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1663009 + ... + 2010829.

It is an arithmetic number, because the mean of its divisors is an integer number (45821374636).

Almost surely, 2^638919003499 is an apocalyptic number.

638919003499 is a deficient number, since it is larger than the sum of its proper divisors (94222990677).

638919003499 is a wasteful number, since it uses less digits than its factorization.

638919003499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348886.

The product of its (nonzero) digits is 11337408, while the sum is 61.

The spelling of 638919003499 in words is "six hundred thirty-eight billion, nine hundred nineteen million, three thousand, four hundred ninety-nine".