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17947668905 = 515972247673
BaseRepresentation
bin10000101101110000…
…111011000110101001
31201022210201001020222
4100231300323012221
5243224100401110
612124532455425
71203521445215
oct205560730651
951283631228
1017947668905
11767aa9a321
12358a77a575
13190043a13a
14c238c7945
157009bcc55
hex42dc3b1a9

17947668905 has 8 divisors (see below), whose sum is σ = 21550698312. Its totient is φ = 14349138048.

The previous prime is 17947668901. The next prime is 17947669001. The reversal of 17947668905 is 50986674971.

It can be written as a sum of positive squares in 4 ways, for example, as 3475338304 + 14472330601 = 58952^2 + 120301^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 17947668905 - 22 = 17947668901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17947668901) 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 in 7 ways as a sum of consecutive naturals, for example, 1115852 + ... + 1131821.

It is an arithmetic number, because the mean of its divisors is an integer number (2693837289).

Almost surely, 217947668905 is an apocalyptic number.

It is an amenable number.

17947668905 is a deficient number, since it is larger than the sum of its proper divisors (3603029407).

17947668905 is a wasteful number, since it uses less digits than its factorization.

17947668905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249275.

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 17947668905 in words is "seventeen billion, nine hundred forty-seven million, six hundred sixty-eight thousand, nine hundred five".

Divisors: 1 5 1597 7985 2247673 11238365 3589533781 17947668905