999687885310201 has 4 divisors (see below), whose sum is σ = 999687964354804. Its totient is φ = 999687806265600.

The previous prime is 999687885310187. The next prime is 999687885310211. The reversal of 999687885310201 is 102013588786999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 349725493500601 + 649962391809600 = 18700949^2 + 25494360^2 .

It is a 3-Lehmer number, since φ(999687885310201) divides (999687885310201-1)³.

It is a cyclic number.

It is not a de Polignac number, because 999687885310201 - 2¹⁷ = 999687885179129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999687885310211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15808920 + ... + 47426761.

It is an arithmetic number, because the mean of its divisors is an integer number (249921991088701).

It is a Poulet number, since it divides 2^{999687885310200}-1.

Almost surely, 2^{999687885310201} is an apocalyptic number.

999687885310201 is the 15808921-st decagonal number.

It is an amenable number.

999687885310201 is a deficient number, since it is larger than the sum of its proper divisors (79044603).

999687885310201 is a wasteful number, since it uses less digits than its factorization.

999687885310201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79044602.

The product of its (nonzero) digits is 470292480, while the sum is 76.

The spelling of 999687885310201 in words is "nine hundred ninety-nine trillion, six hundred eighty-seven billion, eight hundred eighty-five million, three hundred ten thousand, two hundred one".