9990173639 has 2 divisors, whose sum is σ = 9990173640. Its totient is φ = 9990173638.

The previous prime is 9990173629. The next prime is 9990173681. The reversal of 9990173639 is 9363710999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9990173639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990173629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995086819 + 4995086820.

It is an arithmetic number, because the mean of its divisors is an integer number (4995086820).

Almost surely, 2^9990173639 is an apocalyptic number.

9990173639 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990173639 is an equidigital number, since it uses as much as digits as its factorization.

9990173639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2480058, while the sum is 56.

The square root of 9990173639 is about 99950.8561193950. The cubic root of 9990173639 is about 2153.7287836645.

The spelling of 9990173639 in words is "nine billion, nine hundred ninety million, one hundred seventy-three thousand, six hundred thirty-nine".