4209417661 has 2 divisors, whose sum is σ = 4209417662. Its totient is φ = 4209417660.

The previous prime is 4209417659. The next prime is 4209417679. The reversal of 4209417661 is 1667149024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2908444900 + 1300972761 = 53930^2 + 36069^2 .

It is a cyclic number.

It is not a de Polignac number, because 4209417661 - 2¹ = 4209417659 is a prime.

Together with 4209417659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4209447661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2104708830 + 2104708831.

It is an arithmetic number, because the mean of its divisors is an integer number (2104708831).

Almost surely, 2^4209417661 is an apocalyptic number.

It is an amenable number.

4209417661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4209417661 is an equidigital number, since it uses as much as digits as its factorization.

4209417661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 4209417661 is about 64880.0251310062. The cubic root of 4209417661 is about 1614.6336762720.

The spelling of 4209417661 in words is "four billion, two hundred nine million, four hundred seventeen thousand, six hundred sixty-one".