1999816826501 has 16 divisors (see below), whose sum is σ = 2167806009600. Its totient is φ = 1833854862528.

The previous prime is 1999816826473. The next prime is 1999816826599. The reversal of 1999816826501 is 1056286189991.

It is not a de Polignac number, because 1999816826501 - 2²² = 1999812632197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999816826101) 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 15 ways as a sum of consecutive naturals, for example, 10228580 + ... + 10422258.

It is an arithmetic number, because the mean of its divisors is an integer number (135487875600).

Almost surely, 2^{1999816826501} is an apocalyptic number.

It is an amenable number.

1999816826501 is a deficient number, since it is larger than the sum of its proper divisors (167989183099).

1999816826501 is a wasteful number, since it uses less digits than its factorization.

1999816826501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198908.

The product of its (nonzero) digits is 16796160, while the sum is 65.

The spelling of 1999816826501 in words is "one trillion, nine hundred ninety-nine billion, eight hundred sixteen million, eight hundred twenty-six thousand, five hundred one".