538620945407989 has 2 divisors, whose sum is σ = 538620945407990. Its totient is φ = 538620945407988.

The previous prime is 538620945407939. The next prime is 538620945408019. The reversal of 538620945407989 is 989704549026835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373471664922225 + 165149280485764 = 19325415^2 + 12851042^2 .

It is a cyclic number.

It is not a de Polignac number, because 538620945407989 - 2¹⁹ = 538620944883701 is a prime.

It is a super-2 number, since 2×538620945407989² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538620945407939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269310472703994 + 269310472703995.

It is an arithmetic number, because the mean of its divisors is an integer number (269310472703995).

Almost surely, 2^{538620945407989} is an apocalyptic number.

It is an amenable number.

538620945407989 is a deficient number, since it is larger than the sum of its proper divisors (1).

538620945407989 is an equidigital number, since it uses as much as digits as its factorization.

538620945407989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4702924800, while the sum is 79.

The spelling of 538620945407989 in words is "five hundred thirty-eight trillion, six hundred twenty billion, nine hundred forty-five million, four hundred seven thousand, nine hundred eighty-nine".