18428972513377 has 2 divisors, whose sum is σ = 18428972513378. Its totient is φ = 18428972513376.

The previous prime is 18428972513297. The next prime is 18428972513387. The reversal of 18428972513377 is 77331527982481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11842070795361 + 6586901718016 = 3441231^2 + 2566496^2 .

It is a cyclic number.

It is not a de Polignac number, because 18428972513377 - 2²⁷ = 18428838295649 is a prime.

It is not a weakly prime, because it can be changed into another prime (18428972513387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214486256688 + 9214486256689.

It is an arithmetic number, because the mean of its divisors is an integer number (9214486256689).

Almost surely, 2^{18428972513377} is an apocalyptic number.

It is an amenable number.

18428972513377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428972513377 is an equidigital number, since it uses as much as digits as its factorization.

18428972513377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142248960, while the sum is 67.

The spelling of 18428972513377 in words is "eighteen trillion, four hundred twenty-eight billion, nine hundred seventy-two million, five hundred thirteen thousand, three hundred seventy-seven".