86666641 has 2 divisors, whose sum is σ = 86666642. Its totient is φ = 86666640.

The previous prime is 86666633. The next prime is 86666677. The reversal of 86666641 is 14666668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67174416 + 19492225 = 8196^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 86666641 - 2³ = 86666633 is a prime.

It is a super-2 number, since 2×86666641² = 15022213324445762, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (86666621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43333320 + 43333321.

It is an arithmetic number, because the mean of its divisors is an integer number (43333321).

Almost surely, 2^86666641 is an apocalyptic number.

It is an amenable number.

86666641 is a deficient number, since it is larger than the sum of its proper divisors (1).

86666641 is an equidigital number, since it uses as much as digits as its factorization.

86666641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The square root of 86666641 is about 9309.4919839914. The cubic root of 86666641 is about 442.5380877341.

The spelling of 86666641 in words is "eighty-six million, six hundred sixty-six thousand, six hundred forty-one".