999991111166634 has 16 divisors (see below), whose sum is σ = 2002252349724480. Its totient is φ = 332952015823680.

The previous prime is 999991111166633. The next prime is 999991111166687. The reversal of 999991111166634 is 436661111199999.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999991111166633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94588635574 + ... + 94588646145.

It is an arithmetic number, because the mean of its divisors is an integer number (125140771857780).

Almost surely, 2^{999991111166634} is an apocalyptic number.

999991111166634 is an abundant number, since it is smaller than the sum of its proper divisors (1002261238557846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999991111166634 is a wasteful number, since it uses less digits than its factorization.

999991111166634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189177282605.

The product of its digits is 153055008, while the sum is 75.

The spelling of 999991111166634 in words is "nine hundred ninety-nine trillion, nine hundred ninety-one billion, one hundred eleven million, one hundred sixty-six thousand, six hundred thirty-four".