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68166669 = 322722223
BaseRepresentation
bin1000001000000…
…10010000001101
311202021020002110
410010002100031
5114422313134
610433014233
71455256434
oct404022015
9152236073
1068166669
113552969a
121a9b4379
131117920c
1490a611b
155eb77e9
hex410240d

68166669 has 4 divisors (see below), whose sum is σ = 90888896. Its totient is φ = 45444444.

The previous prime is 68166667. The next prime is 68166677. The reversal of 68166669 is 96666186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 68166669 - 21 = 68166667 is a prime.

It is a super-2 number, since 2×681666692 = 9293389525111122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68166667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11361109 + ... + 11361114.

It is an arithmetic number, because the mean of its divisors is an integer number (22722224).

Almost surely, 268166669 is an apocalyptic number.

It is an amenable number.

68166669 is a deficient number, since it is larger than the sum of its proper divisors (22722227).

68166669 is a wasteful number, since it uses less digits than its factorization.

68166669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22722226.

The product of its digits is 559872, while the sum is 48.

The square root of 68166669 is about 8256.3108589733. The cubic root of 68166669 is about 408.4987113355.

The spelling of 68166669 in words is "sixty-eight million, one hundred sixty-six thousand, six hundred sixty-nine".

Divisors: 1 3 22722223 68166669