416666681 has 2 divisors, whose sum is σ = 416666682. Its totient is φ = 416666680.

The previous prime is 416666633. The next prime is 416666683. The reversal of 416666681 is 186666614.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386515600 + 30151081 = 19660^2 + 5491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-416666681 is a prime.

It is a super-2 number, since 2×416666681² = 347222246111111522, which contains 22 as substring.

Together with 416666683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (416666683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208333340 + 208333341.

It is an arithmetic number, because the mean of its divisors is an integer number (208333341).

Almost surely, 2^416666681 is an apocalyptic number.

It is an amenable number.

416666681 is a deficient number, since it is larger than the sum of its proper divisors (1).

416666681 is an equidigital number, since it uses as much as digits as its factorization.

416666681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 416666681 is about 20412.4148742867. The cubic root of 416666681 is about 746.9007996573.

The spelling of 416666681 in words is "four hundred sixteen million, six hundred sixty-six thousand, six hundred eighty-one".