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18978979282177 is a prime number
BaseRepresentation
bin1000101000010111000110…
…10100010111110100000001
32111012101001200211222022011
410110023203110113310001
54441422422144012202
6104210453412412521
73666120541066135
oct424134324276401
974171050758264
1018978979282177
116057a38029782
122166305917141
13a7893002b335
1449883214b3c5
1522da47e7dbd7
hex1142e3517d01

18978979282177 has 2 divisors, whose sum is σ = 18978979282178. Its totient is φ = 18978979282176.

The previous prime is 18978979282163. The next prime is 18978979282217. The reversal of 18978979282177 is 77128297987981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18517797039361 + 461182242816 = 4303231^2 + 679104^2 .

It is a cyclic number.

It is not a de Polignac number, because 18978979282177 - 227 = 18978845064449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18978979282094 and 18978979282103.

It is not a weakly prime, because it can be changed into another prime (18978979286177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489489641088 + 9489489641089.

It is an arithmetic number, because the mean of its divisors is an integer number (9489489641089).

Almost surely, 218978979282177 is an apocalyptic number.

It is an amenable number.

18978979282177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18978979282177 is an equidigital number, since it uses as much as digits as its factorization.

18978979282177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584673792, while the sum is 85.

The spelling of 18978979282177 in words is "eighteen trillion, nine hundred seventy-eight billion, nine hundred seventy-nine million, two hundred eighty-two thousand, one hundred seventy-seven".