1099991612518 has 4 divisors (see below), whose sum is σ = 1649987418780.
Its totient is φ = 549995806258.
The previous prime is 1099991612477. The next prime is 1099991612519. The reversal of 1099991612518 is 8152161999901.
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1099991612519) 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 as a sum of consecutive naturals, namely, 274997903128 + ... + 274997903131.
It is an arithmetic number, because the mean of its divisors is an integer number (412496854695).
Almost surely, 21099991612518 is an apocalyptic number.
1099991612518 is a deficient number, since it is larger than the sum of its proper divisors (549995806262).
1099991612518 is an equidigital number, since it uses as much as digits as its factorization.
1099991612518 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 549995806261.
The product of its (nonzero) digits is 3149280, while the sum is 61.
The spelling of 1099991612518 in words is "one trillion, ninety-nine billion, nine hundred ninety-one million, six hundred twelve thousand, five hundred eighteen".