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18438971117089 is a prime number
BaseRepresentation
bin1000011000101001010000…
…10100101100111000100001
32102021202012121012220011111
410030110220110230320201
54404101003101221324
6103114425115343321
73612112615320655
oct414245024547041
972252177186144
1018438971117089
115969a18546736
12209971a151b41
13a39a3122c6c3
1447a645632a65
1521e98ec9e794
hex10c52852ce21

18438971117089 has 2 divisors, whose sum is σ = 18438971117090. Its totient is φ = 18438971117088.

The previous prime is 18438971117057. The next prime is 18438971117113. The reversal of 18438971117089 is 98071117983481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14866360798864 + 3572610318225 = 3855692^2 + 1890135^2 .

It is a cyclic number.

It is not a de Polignac number, because 18438971117089 - 25 = 18438971117057 is a prime.

It is not a weakly prime, because it can be changed into another prime (18438971117029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9219485558544 + 9219485558545.

It is an arithmetic number, because the mean of its divisors is an integer number (9219485558545).

Almost surely, 218438971117089 is an apocalyptic number.

It is an amenable number.

18438971117089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18438971117089 is an equidigital number, since it uses as much as digits as its factorization.

18438971117089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 67.

The spelling of 18438971117089 in words is "eighteen trillion, four hundred thirty-eight billion, nine hundred seventy-one million, one hundred seventeen thousand, eighty-nine".