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66666666665 = 5163409199999
BaseRepresentation
bin111110000101101001…
…001001101010101001
320101002010002120011102
4332011221021222221
52043013131313130
650343134011145
74550030213444
oct760551115251
9211063076142
1066666666665
1126300660435
1210b06646ab5
136395994071
14332604065b
151b02b76645
hexf85a49aa9

66666666665 has 16 divisors (see below), whose sum is σ = 80688000000. Its totient is φ = 52876271232.

The previous prime is 66666666643. The next prime is 66666666667. The reversal of 66666666665 is 56666666666.

Subtracting from 66666666665 its reverse (56666666666), we obtain a palindrome (9999999999).

66666666665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66666666665 - 210 = 66666665641 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66666666667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233336 + ... + 433334.

It is an arithmetic number, because the mean of its divisors is an integer number (5043000000).

Almost surely, 266666666665 is an apocalyptic number.

It is an amenable number.

66666666665 is a deficient number, since it is larger than the sum of its proper divisors (14021333335).

66666666665 is a wasteful number, since it uses less digits than its factorization.

66666666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200576.

The product of its digits is 302330880, while the sum is 65.

The spelling of 66666666665 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-five".