999869644801 has 2 divisors, whose sum is σ = 999869644802. Its totient is φ = 999869644800.

The previous prime is 999869644771. The next prime is 999869644817. The reversal of 999869644801 is 108446968999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 973488089025 + 26381555776 = 986655^2 + 162424^2 .

It is a cyclic number.

It is not a de Polignac number, because 999869644801 - 2⁷ = 999869644673 is a prime.

It is not a weakly prime, because it can be changed into another prime (999869644001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499934822400 + 499934822401.

It is an arithmetic number, because the mean of its divisors is an integer number (499934822401).

It is a Proth number, since it is equal to 476775 ⋅ 2²¹ + 1 and 476775 < 2²¹.

Almost surely, 2^999869644801 is an apocalyptic number.

It is an amenable number.

999869644801 is a deficient number, since it is larger than the sum of its proper divisors (1).

999869644801 is an equidigital number, since it uses as much as digits as its factorization.

999869644801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241864704, while the sum is 73.

The spelling of 999869644801 in words is "nine hundred ninety-nine billion, eight hundred sixty-nine million, six hundred forty-four thousand, eight hundred one".