991092043555 has 8 divisors (see below), whose sum is σ = 1189356574752. Its totient is φ = 792842886528.

The previous prime is 991092043547. The next prime is 991092043567. The reversal of 991092043555 is 555340290199.

991092043555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 991092043555 - 2³ = 991092043547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3701239 + ... + 3959968.

It is an arithmetic number, because the mean of its divisors is an integer number (148669571844).

Almost surely, 2^991092043555 is an apocalyptic number.

991092043555 is a deficient number, since it is larger than the sum of its proper divisors (198264531197).

991092043555 is a wasteful number, since it uses less digits than its factorization.

991092043555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7687085.

The product of its (nonzero) digits is 2187000, while the sum is 52.

The spelling of 991092043555 in words is "nine hundred ninety-one billion, ninety-two million, forty-three thousand, five hundred fifty-five".