999887641000001 has 8 divisors (see below), whose sum is σ = 1076806976808360. Its totient is φ = 922969005460992.

The previous prime is 999887640999937. The next prime is 999887641000013. The reversal of 999887641000001 is 100000146788999.

It is a Cunningham number, because it is equal to 31621000²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 999887641000000 = 1^2 + 31621000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999887641000001 - 2⁶ = 999887640999937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999887641000021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172099910 + ... + 177814943.

It is an arithmetic number, because the mean of its divisors is an integer number (134600872101045).

Almost surely, 2^{999887641000001} is an apocalyptic number.

It is an amenable number.

999887641000001 is a deficient number, since it is larger than the sum of its proper divisors (76919335808359).

999887641000001 is a wasteful number, since it uses less digits than its factorization.

999887641000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350134675.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The spelling of 999887641000001 in words is "nine hundred ninety-nine trillion, eight hundred eighty-seven billion, six hundred forty-one million, one", and thus it is an aban number.