9905220623 has 2 divisors, whose sum is σ = 9905220624. Its totient is φ = 9905220622.

The previous prime is 9905220613. The next prime is 9905220643. The reversal of 9905220623 is 3260225099.

9905220623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9905220623 - 2¹⁶ = 9905155087 is a prime.

It is a super-2 number, since 2×9905220623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9905220613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4952610311 + 4952610312.

It is an arithmetic number, because the mean of its divisors is an integer number (4952610312).

Almost surely, 2^9905220623 is an apocalyptic number.

9905220623 is a deficient number, since it is larger than the sum of its proper divisors (1).

9905220623 is an equidigital number, since it uses as much as digits as its factorization.

9905220623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 9905220623 is about 99524.9748706323. The cubic root of 9905220623 is about 2147.6065395276.

The spelling of 9905220623 in words is "nine billion, nine hundred five million, two hundred twenty thousand, six hundred twenty-three".