638298516013 has 6 divisors (see below), whose sum is σ = 644555765454. Its totient is φ = 632101432536.

The previous prime is 638298515903. The next prime is 638298516043. The reversal of 638298516013 is 310615892836.

638298516013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 371053976164 + 267244539849 = 609142^2 + 516957^2 .

It is not a de Polignac number, because 638298516013 - 2²¹ = 638296418861 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 (638298516043) 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, 30072270 + ... + 30093487.

It is an arithmetic number, because the mean of its divisors is an integer number (107425960909).

Almost surely, 2^638298516013 is an apocalyptic number.

It is an amenable number.

638298516013 is a deficient number, since it is larger than the sum of its proper divisors (6257249441).

638298516013 is an equidigital number, since it uses as much as digits as its factorization.

638298516013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60165963 (or 60165860 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 638298516013 in words is "six hundred thirty-eight billion, two hundred ninety-eight million, five hundred sixteen thousand, thirteen".