10991569915 has 16 divisors (see below), whose sum is σ = 13500672768. Its totient is φ = 8586186336.

The previous prime is 10991569871. The next prime is 10991569949. The reversal of 10991569915 is 51996519901.

It is a de Polignac number, because none of the positive numbers 2^k-10991569915 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1048932 + ... + 1059358.

It is an arithmetic number, because the mean of its divisors is an integer number (843792048).

Almost surely, 2^10991569915 is an apocalyptic number.

10991569915 is a deficient number, since it is larger than the sum of its proper divisors (2509102853).

10991569915 is a wasteful number, since it uses less digits than its factorization.

10991569915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15378.

The product of its (nonzero) digits is 984150, while the sum is 55.

The spelling of 10991569915 in words is "ten billion, nine hundred ninety-one million, five hundred sixty-nine thousand, nine hundred fifteen".