999545473081 has 2 divisors, whose sum is σ = 999545473082. Its totient is φ = 999545473080.

The previous prime is 999545473057. The next prime is 999545473127. The reversal of 999545473081 is 180374545999.

It is the 408156-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988831360000 + 10714113081 = 994400^2 + 103509^2 .

It is a cyclic number.

It is not a de Polignac number, because 999545473081 - 2¹³ = 999545464889 is a prime.

It is a super-2 number, since 2×999545473081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999545483081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499772736540 + 499772736541.

It is an arithmetic number, because the mean of its divisors is an integer number (499772736541).

Almost surely, 2^999545473081 is an apocalyptic number.

It is an amenable number.

999545473081 is a deficient number, since it is larger than the sum of its proper divisors (1).

999545473081 is an equidigital number, since it uses as much as digits as its factorization.

999545473081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48988800, while the sum is 64.

The spelling of 999545473081 in words is "nine hundred ninety-nine billion, five hundred forty-five million, four hundred seventy-three thousand, eighty-one".