1999692131918 has 24 divisors (see below), whose sum is σ = 3255419574000. Its totient is φ = 920832404544.

The previous prime is 1999692131917. The next prime is 1999692131923. The reversal of 1999692131918 is 8191312969991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999692131917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6589943 + ... + 6886706.

It is an arithmetic number, because the mean of its divisors is an integer number (135642482250).

Almost surely, 2^{1999692131918} is an apocalyptic number.

1999692131918 is a deficient number, since it is larger than the sum of its proper divisors (1255727442082).

1999692131918 is a wasteful number, since it uses less digits than its factorization.

1999692131918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13477116 (or 13477103 counting only the distinct ones).

The product of its digits is 17006112, while the sum is 68.

The spelling of 1999692131918 in words is "one trillion, nine hundred ninety-nine billion, six hundred ninety-two million, one hundred thirty-one thousand, nine hundred eighteen".