8455661 has 2 divisors, whose sum is σ = 8455662. Its totient is φ = 8455660.

The previous prime is 8455639. The next prime is 8455669. The reversal of 8455661 is 1665548.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6280036 + 2175625 = 2506^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 8455661 - 2⁶ = 8455597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8455669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4227830 + 4227831.

It is an arithmetic number, because the mean of its divisors is an integer number (4227831).

Almost surely, 2^8455661 is an apocalyptic number.

It is an amenable number.

8455661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8455661 is an equidigital number, since it uses as much as digits as its factorization.

8455661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 8455661 is about 2907.8619293220. The cubic root of 8455661 is about 203.7272803904.

The spelling of 8455661 in words is "eight million, four hundred fifty-five thousand, six hundred sixty-one".