18638828213513 has 2 divisors, whose sum is σ = 18638828213514. Its totient is φ = 18638828213512.

The previous prime is 18638828213479. The next prime is 18638828213611. The reversal of 18638828213513 is 31531282883681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16003816227529 + 2635011985984 = 4000477^2 + 1623272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18638828213513 is a prime.

It is a super-2 number, since 2×18638828213513² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18638828293513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9319414106756 + 9319414106757.

It is an arithmetic number, because the mean of its divisors is an integer number (9319414106757).

Almost surely, 2^{18638828213513} is an apocalyptic number.

It is an amenable number.

18638828213513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18638828213513 is an equidigital number, since it uses as much as digits as its factorization.

18638828213513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13271040, while the sum is 59.

The spelling of 18638828213513 in words is "eighteen trillion, six hundred thirty-eight billion, eight hundred twenty-eight million, two hundred thirteen thousand, five hundred thirteen".