999997538090923 has 2 divisors, whose sum is σ = 999997538090924. Its totient is φ = 999997538090922.

The previous prime is 999997538090753. The next prime is 999997538091001. The reversal of 999997538090923 is 329090835799999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999997538090923 is a prime.

It is not a weakly prime, because it can be changed into another prime (999997538040923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998769045461 + 499998769045462.

It is an arithmetic number, because the mean of its divisors is an integer number (499998769045462).

Almost surely, 2^{999997538090923} is an apocalyptic number.

999997538090923 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997538090923 is an equidigital number, since it uses as much as digits as its factorization.

999997538090923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24106163760, while the sum is 91.

The spelling of 999997538090923 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred thirty-eight million, ninety thousand, nine hundred twenty-three".