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18538247489 is a prime number
BaseRepresentation
bin10001010000111101…
…110011010101000001
31202211221222112202212
4101100331303111001
5300431242404424
612303310551505
71224252334526
oct212075632501
952757875685
1018538247489
1179533a27a3
123714508595
1319958b7618
14c7c0db14d
1573777910e
hex450f73541

18538247489 has 2 divisors, whose sum is σ = 18538247490. Its totient is φ = 18538247488.

The previous prime is 18538247461. The next prime is 18538247527. The reversal of 18538247489 is 98474283581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14918179600 + 3620067889 = 122140^2 + 60167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18538247489 is a prime.

It is not a weakly prime, because it can be changed into another prime (18538247449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9269123744 + 9269123745.

It is an arithmetic number, because the mean of its divisors is an integer number (9269123745).

Almost surely, 218538247489 is an apocalyptic number.

It is an amenable number.

18538247489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18538247489 is an equidigital number, since it uses as much as digits as its factorization.

18538247489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15482880, while the sum is 59.

The spelling of 18538247489 in words is "eighteen billion, five hundred thirty-eight million, two hundred forty-seven thousand, four hundred eighty-nine".