991104137666 has 8 divisors (see below), whose sum is σ = 1518287189760. Its totient is φ = 485008407748.

The previous prime is 991104137659. The next prime is 991104137719. The reversal of 991104137666 is 666731401199.

991104137666 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5271830426 + ... + 5271830613.

It is an arithmetic number, because the mean of its divisors is an integer number (189785898720).

Almost surely, 2^991104137666 is an apocalyptic number.

991104137666 is a deficient number, since it is larger than the sum of its proper divisors (527183052094).

991104137666 is a wasteful number, since it uses less digits than its factorization.

991104137666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10543661088.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The spelling of 991104137666 in words is "nine hundred ninety-one billion, one hundred four million, one hundred thirty-seven thousand, six hundred sixty-six".