999998654211111 has 4 divisors (see below), whose sum is σ = 1333331538948152. Its totient is φ = 666665769474072.

The previous prime is 999998654211101. The next prime is 999998654211119. The reversal of 999998654211111 is 111112456899999.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-999998654211111 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998654211119) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166666442368516 + ... + 166666442368521.

It is an arithmetic number, because the mean of its divisors is an integer number (333332884737038).

Almost surely, 2^{999998654211111} is an apocalyptic number.

999998654211111 is a deficient number, since it is larger than the sum of its proper divisors (333332884737041).

999998654211111 is a wasteful number, since it uses less digits than its factorization.

999998654211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333332884737040.

The product of its digits is 113374080, while the sum is 75.

The spelling of 999998654211111 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, six hundred fifty-four million, two hundred eleven thousand, one hundred eleven".