416666666666691 has 20 divisors (see below), whose sum is σ = 711346266902832. Its totient is φ = 238095238094928.

The previous prime is 416666666666689. The next prime is 416666666666749. The reversal of 416666666666691 is 196666666666614.

It is not a de Polignac number, because 416666666666691 - 2¹ = 416666666666689 is a prime.

It is a super-2 number, since 2×416666666666691² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 416666666666691.

It is not an unprimeable number, because it can be changed into a prime (416666666666641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 367430922420 + ... + 367430923553.

Almost surely, 2^{416666666666691} is an apocalyptic number.

416666666666691 is a deficient number, since it is larger than the sum of its proper divisors (294679600236141).

416666666666691 is an equidigital number, since it uses as much as digits as its factorization.

416666666666691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734861845992 (or 734861845983 counting only the distinct ones).

The product of its digits is 13060694016, while the sum is 81.

The spelling of 416666666666691 in words is "four hundred sixteen trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred ninety-one".