8355661 has 2 divisors, whose sum is σ = 8355662. Its totient is φ = 8355660.

The previous prime is 8355623. The next prime is 8355667. The reversal of 8355661 is 1665538.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7123561 + 1232100 = 2669^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 8355661 - 2⁷ = 8355533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8355667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4177830 + 4177831.

It is an arithmetic number, because the mean of its divisors is an integer number (4177831).

Almost surely, 2^8355661 is an apocalyptic number.

It is an amenable number.

8355661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8355661 is an equidigital number, since it uses as much as digits as its factorization.

8355661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 8355661 is about 2890.6160243104. The cubic root of 8355661 is about 202.9209735509.

The spelling of 8355661 in words is "eight million, three hundred fifty-five thousand, six hundred sixty-one".