416781661 has 2 divisors, whose sum is σ = 416781662. Its totient is φ = 416781660.

The previous prime is 416781647. The next prime is 416781691. The reversal of 416781661 is 166187614.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 368409636 + 48372025 = 19194^2 + 6955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-416781661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (416781611) 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, 208390830 + 208390831.

It is an arithmetic number, because the mean of its divisors is an integer number (208390831).

Almost surely, 2^416781661 is an apocalyptic number.

It is an amenable number.

416781661 is a deficient number, since it is larger than the sum of its proper divisors (1).

416781661 is an equidigital number, since it uses as much as digits as its factorization.

416781661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 416781661 is about 20415.2311032719. The cubic root of 416781661 is about 746.9694962595.

The spelling of 416781661 in words is "four hundred sixteen million, seven hundred eighty-one thousand, six hundred sixty-one".