999999995805673 has 2 divisors, whose sum is σ = 999999995805674. Its totient is φ = 999999995805672.

The previous prime is 999999995805667. The next prime is 999999995805677. The reversal of 999999995805673 is 376508599999999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 801572288450704 + 198427707354969 = 28312052^2 + 14086437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999995805673 is a prime.

It is a super-2 number, since 2×999999995805673² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999999995805677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999997902836 + 499999997902837.

It is an arithmetic number, because the mean of its divisors is an integer number (499999997902837).

Almost surely, 2^{999999995805673} is an apocalyptic number.

It is an amenable number.

999999995805673 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999995805673 is an equidigital number, since it uses as much as digits as its factorization.

999999995805673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1084777369200, while the sum is 106.

The spelling of 999999995805673 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-five million, eight hundred five thousand, six hundred seventy-three".