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68516161 = 721398289
BaseRepresentation
bin1000001010101…
…11100101000001
311202220222111121
410011113211001
5120020004121
610444312241
71461243400
oct405274501
9152828447
1068516161
113574822a
121ab42681
131126c30c
149157637
156036141
hex4157941

68516161 has 6 divisors (see below), whose sum is σ = 79702530. Its totient is φ = 58728096.

The previous prime is 68516101. The next prime is 68516167. The reversal of 68516161 is 16161586.

It can be written as a sum of positive squares in only one way, i.e., 39690000 + 28826161 = 6300^2 + 5369^2 .

It is not a de Polignac number, because 68516161 - 211 = 68514113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68516167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 699096 + ... + 699193.

It is an arithmetic number, because the mean of its divisors is an integer number (13283755).

Almost surely, 268516161 is an apocalyptic number.

It is an amenable number.

68516161 is a deficient number, since it is larger than the sum of its proper divisors (11186369).

68516161 is a wasteful number, since it uses less digits than its factorization.

68516161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398303 (or 1398296 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 68516161 is about 8277.4489427601. The cubic root of 68516161 is about 409.1956488878.

The spelling of 68516161 in words is "sixty-eight million, five hundred sixteen thousand, one hundred sixty-one".

Divisors: 1 7 49 1398289 9788023 68516161