916665666641 has 4 divisors (see below), whose sum is σ = 917079887412. Its totient is φ = 916251445872.

The previous prime is 916665666601. The next prime is 916665666691. The reversal of 916665666641 is 146666566619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146666566619 = 233 ⋅629470243.

It can be written as a sum of positive squares in 2 ways, for example, as 583205615041 + 333460051600 = 763679^2 + 577460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-916665666641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (916665666601) 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 in 3 ways as a sum of consecutive naturals, for example, 207107066 + ... + 207111491.

It is an arithmetic number, because the mean of its divisors is an integer number (229269971853).

Almost surely, 2^916665666641 is an apocalyptic number.

It is an amenable number.

916665666641 is a deficient number, since it is larger than the sum of its proper divisors (414220771).

916665666641 is a wasteful number, since it uses less digits than its factorization.

916665666641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414220770.

The product of its digits is 50388480, while the sum is 62.

The spelling of 916665666641 in words is "nine hundred sixteen billion, six hundred sixty-five million, six hundred sixty-six thousand, six hundred forty-one".