990111011011 has 4 divisors (see below), whose sum is σ = 997907160832. Its totient is φ = 982314861192.

The previous prime is 990111010951. The next prime is 990111011027. The reversal of 990111011011 is 110110111099.

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

It is a cyclic number.

It is not a de Polignac number, because 990111011011 - 2²⁷ = 989976793283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990111011041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3898074720 + ... + 3898074973.

It is an arithmetic number, because the mean of its divisors is an integer number (249476790208).

Almost surely, 2^990111011011 is an apocalyptic number.

990111011011 is a deficient number, since it is larger than the sum of its proper divisors (7796149821).

990111011011 is a wasteful number, since it uses less digits than its factorization.

990111011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7796149820.

The product of its (nonzero) digits is 81, while the sum is 25.

The spelling of 990111011011 in words is "nine hundred ninety billion, one hundred eleven million, eleven thousand, eleven".