8648043661 has 2 divisors, whose sum is σ = 8648043662. Its totient is φ = 8648043660.

The previous prime is 8648043643. The next prime is 8648043671. The reversal of 8648043661 is 1663408468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8264628100 + 383415561 = 90910^2 + 19581^2 .

It is a cyclic number.

It is not a de Polignac number, because 8648043661 - 2⁷ = 8648043533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8648043641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4324021830 + 4324021831.

It is an arithmetic number, because the mean of its divisors is an integer number (4324021831).

Almost surely, 2^8648043661 is an apocalyptic number.

It is an amenable number.

8648043661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8648043661 is an equidigital number, since it uses as much as digits as its factorization.

8648043661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 8648043661 is about 92994.8582503355. The cubic root of 8648043661 is about 2052.6077193762.

The spelling of 8648043661 in words is "eight billion, six hundred forty-eight million, forty-three thousand, six hundred sixty-one".