999911555991111 has 8 divisors (see below), whose sum is σ = 1335998738695680. Its totient is φ = 665216038640312.

The previous prime is 999911555991083. The next prime is 999911555991113. The reversal of 999911555991111 is 111199555119999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999911555991111 - 2²⁵ = 999911522436679 is a prime.

It is a super-2 number, since 2×999911555991111² (a number of 31 digits) contains 22 as substring.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999911555991113) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347916336765 + ... + 347916339638.

It is an arithmetic number, because the mean of its divisors is an integer number (166999842336960).

Almost surely, 2^{999911555991111} is an apocalyptic number.

999911555991111 is a deficient number, since it is larger than the sum of its proper divisors (336087182704569).

999911555991111 is a wasteful number, since it uses less digits than its factorization.

999911555991111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695832676885.

The product of its digits is 66430125, while the sum is 75.

The spelling of 999911555991111 in words is "nine hundred ninety-nine trillion, nine hundred eleven billion, five hundred fifty-five million, nine hundred ninety-one thousand, one hundred eleven".