638322660479 has 6 divisors (see below), whose sum is σ = 742538605104. Its totient is φ = 547133708940.

The previous prime is 638322660439. The next prime is 638322660527. The reversal of 638322660479 is 974066223836.

It is not a de Polignac number, because 638322660479 - 2⁸ = 638322660223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638322660439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6513496487 + ... + 6513496584.

It is an arithmetic number, because the mean of its divisors is an integer number (123756434184).

Almost surely, 2^638322660479 is an apocalyptic number.

638322660479 is a deficient number, since it is larger than the sum of its proper divisors (104215944625).

638322660479 is a wasteful number, since it uses less digits than its factorization.

638322660479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13026993085 (or 13026993078 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 638322660479 in words is "six hundred thirty-eight billion, three hundred twenty-two million, six hundred sixty thousand, four hundred seventy-nine".