999997555310623 has 2 divisors, whose sum is σ = 999997555310624. Its totient is φ = 999997555310622.

The previous prime is 999997555310573. The next prime is 999997555310659. The reversal of 999997555310623 is 326013555799999.

999997555310623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999997555310623 - 2⁴¹ = 997798532055071 is a prime.

It is a super-2 number, since 2×999997555310623² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999997555310723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998777655311 + 499998777655312.

It is an arithmetic number, because the mean of its divisors is an integer number (499998777655312).

Almost surely, 2^{999997555310623} is an apocalyptic number.

999997555310623 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997555310623 is an equidigital number, since it uses as much as digits as its factorization.

999997555310623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5580130500, while the sum is 82.

The spelling of 999997555310623 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred fifty-five million, three hundred ten thousand, six hundred twenty-three".