10991561383 has 8 divisors (see below), whose sum is σ = 12283253136. Its totient is φ = 9748612800.

The previous prime is 10991561377. The next prime is 10991561489. The reversal of 10991561383 is 38316519901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10991561383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991561363) 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 7 ways as a sum of consecutive naturals, for example, 12185316 + ... + 12186217.

It is an arithmetic number, because the mean of its divisors is an integer number (1535406642).

Almost surely, 2^10991561383 is an apocalyptic number.

10991561383 is a deficient number, since it is larger than the sum of its proper divisors (1291691753).

10991561383 is a wasteful number, since it uses less digits than its factorization.

10991561383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24371585.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 10991561383 in words is "ten billion, nine hundred ninety-one million, five hundred sixty-one thousand, three hundred eighty-three".