418161661 has 2 divisors, whose sum is σ = 418161662. Its totient is φ = 418161660.

The previous prime is 418161647. The next prime is 418161677. The reversal of 418161661 is 166161814.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382984900 + 35176761 = 19570^2 + 5931^2 .

It is a cyclic number.

It is not a de Polignac number, because 418161661 - 2⁷ = 418161533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (418161061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209080830 + 209080831.

It is an arithmetic number, because the mean of its divisors is an integer number (209080831).

Almost surely, 2^418161661 is an apocalyptic number.

It is an amenable number.

418161661 is a deficient number, since it is larger than the sum of its proper divisors (1).

418161661 is an equidigital number, since it uses as much as digits as its factorization.

418161661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 418161661 is about 20449.0014670644. The cubic root of 418161661 is about 747.7930148068.

The spelling of 418161661 in words is "four hundred eighteen million, one hundred sixty-one thousand, six hundred sixty-one".