999770030081 has 2 divisors, whose sum is σ = 999770030082. Its totient is φ = 999770030080.

The previous prime is 999770030041. The next prime is 999770030177. The reversal of 999770030081 is 180030077999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 927723417856 + 72046612225 = 963184^2 + 268415^2 .

It is a cyclic number.

It is not a de Polignac number, because 999770030081 - 2³⁴ = 982590160897 is a prime.

It is a super-2 number, since 2×999770030081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999770030011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499885015040 + 499885015041.

It is an arithmetic number, because the mean of its divisors is an integer number (499885015041).

It is a Proth number, since it is equal to 953455 ⋅ 2²⁰ + 1 and 953455 < 2²⁰.

Almost surely, 2^999770030081 is an apocalyptic number.

It is an amenable number.

999770030081 is a deficient number, since it is larger than the sum of its proper divisors (1).

999770030081 is an equidigital number, since it uses as much as digits as its factorization.

999770030081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The spelling of 999770030081 in words is "nine hundred ninety-nine billion, seven hundred seventy million, thirty thousand, eighty-one".