Search a number
-
+
66666665641 is a prime number
BaseRepresentation
bin111110000101101001…
…001001011010101001
320101002010002111202111
4332011221021122221
52043013131300031
650343134002321
74550030210452
oct760551113251
9211063074674
1066666665641
112630065a694
1210b066463a1
136395993764
143326040129
151b02b761b1
hexf85a496a9

66666665641 has 2 divisors, whose sum is σ = 66666665642. Its totient is φ = 66666665640.

The previous prime is 66666665633. The next prime is 66666665657. The reversal of 66666665641 is 14656666666.

66666665641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59826714025 + 6839951616 = 244595^2 + 82704^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666665641 - 23 = 66666665633 is a prime.

It is not a weakly prime, because it can be changed into another prime (66666665621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333332820 + 33333332821.

It is an arithmetic number, because the mean of its divisors is an integer number (33333332821).

Almost surely, 266666665641 is an apocalyptic number.

It is an amenable number.

66666665641 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666665641 is an equidigital number, since it uses as much as digits as its factorization.

66666665641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33592320, while the sum is 58.

The spelling of 66666665641 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-five thousand, six hundred forty-one".