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20981327567 is a prime number
BaseRepresentation
bin10011100010100101…
…011010011011001111
32000011020001212121012
4103202211122123033
5320432204440232
613345542355435
71341636225134
oct234245323317
960136055535
1020981327567
118997459a42
12409672bb7b
131c94aa7a35
14103077258b
1582beae9b2
hex4e295a6cf

20981327567 has 2 divisors, whose sum is σ = 20981327568. Its totient is φ = 20981327566.

The previous prime is 20981327519. The next prime is 20981327663. The reversal of 20981327567 is 76572318902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20981327567 - 222 = 20977133263 is a prime.

It is a super-2 number, since 2×209813275672 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20981321567) 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, 10490663783 + 10490663784.

It is an arithmetic number, because the mean of its divisors is an integer number (10490663784).

Almost surely, 220981327567 is an apocalyptic number.

20981327567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20981327567 is an equidigital number, since it uses as much as digits as its factorization.

20981327567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 20981327567 in words is "twenty billion, nine hundred eighty-one million, three hundred twenty-seven thousand, five hundred sixty-seven".