75166681 has 2 divisors, whose sum is σ = 75166682. Its totient is φ = 75166680.

The previous prime is 75166643. The next prime is 75166739. The reversal of 75166681 is 18666157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74235456 + 931225 = 8616^2 + 965^2 .

It is an emirp because it is prime and its reverse (18666157) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75166681 - 2²³ = 66778073 is a prime.

It is a super-2 number, since 2×75166681² = 11300059865111522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75166181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37583340 + 37583341.

It is an arithmetic number, because the mean of its divisors is an integer number (37583341).

Almost surely, 2^75166681 is an apocalyptic number.

It is an amenable number.

75166681 is a deficient number, since it is larger than the sum of its proper divisors (1).

75166681 is an equidigital number, since it uses as much as digits as its factorization.

75166681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 75166681 is about 8669.8720290440. The cubic root of 75166681 is about 422.0285108355.

The spelling of 75166681 in words is "seventy-five million, one hundred sixty-six thousand, six hundred eighty-one".