999955555551111 has 8 divisors (see below), whose sum is σ = 1355871939730560. Its totient is φ = 655338104202872.

The previous prime is 999955555551103. The next prime is 999955555551133. The reversal of 999955555551111 is 111155555559999.

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 999955555551111 - 2³ = 999955555551103 is a prime.

It is a super-2 number, since 2×999955555551111² (a number of 31 digits) contains 22 as substring.

It is a nialpdrome in base 10.

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 (999955555550111) 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, 2824733207595 + ... + 2824733207948.

It is an arithmetic number, because the mean of its divisors is an integer number (169483992466320).

Almost surely, 2^{999955555551111} is an apocalyptic number.

999955555551111 is a deficient number, since it is larger than the sum of its proper divisors (355916384179449).

999955555551111 is a wasteful number, since it uses less digits than its factorization.

999955555551111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5649466415605.

The product of its digits is 512578125, while the sum is 75.

The spelling of 999955555551111 in words is "nine hundred ninety-nine trillion, nine hundred fifty-five billion, five hundred fifty-five million, five hundred fifty-one thousand, one hundred eleven".