999817216001 has 2 divisors, whose sum is σ = 999817216002. Its totient is φ = 999817216000.

The previous prime is 999817215961. The next prime is 999817216061. The reversal of 999817216001 is 100612718999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 818491137025 + 181326078976 = 904705^2 + 425824^2 .

It is a cyclic number.

It is not a de Polignac number, because 999817216001 - 2¹⁸ = 999816953857 is a prime.

It is not a weakly prime, because it can be changed into another prime (999817216061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499908608000 + 499908608001.

It is an arithmetic number, because the mean of its divisors is an integer number (499908608001).

It is a Proth number, since it is equal to 238375 ⋅ 2²² + 1 and 238375 < 2²².

Almost surely, 2^999817216001 is an apocalyptic number.

It is an amenable number.

999817216001 is a deficient number, since it is larger than the sum of its proper divisors (1).

999817216001 is an equidigital number, since it uses as much as digits as its factorization.

999817216001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 999817216001 in words is "nine hundred ninety-nine billion, eight hundred seventeen million, two hundred sixteen thousand, one".