8520666403 has 2 divisors, whose sum is σ = 8520666404. Its totient is φ = 8520666402.

The previous prime is 8520666377. The next prime is 8520666421. The reversal of 8520666403 is 3046660258.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8520666403 - 2²¹ = 8518569251 is a prime.

It is not a weakly prime, because it can be changed into another prime (8520666443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260333201 + 4260333202.

It is an arithmetic number, because the mean of its divisors is an integer number (4260333202).

Almost surely, 2^8520666403 is an apocalyptic number.

8520666403 is a deficient number, since it is larger than the sum of its proper divisors (1).

8520666403 is an equidigital number, since it uses as much as digits as its factorization.

8520666403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 8520666403 is about 92307.4558364599. The cubic root of 8520666403 is about 2042.4801952269.

The spelling of 8520666403 in words is "eight billion, five hundred twenty million, six hundred sixty-six thousand, four hundred three".