11159989191649 has 3 divisors (see below), whose sum is σ = 11159992532307. Its totient is φ = 11159985850992.

The previous prime is 11159989191647. The next prime is 11159989191683. The reversal of 11159989191649 is 94619198995111.

The square root of 11159989191649 is 3340657.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1701707205025 + 9458281986624 = 1304495^2 + 3075432^2 .

It is not a de Polignac number, because 11159989191649 - 2¹ = 11159989191647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11159989191641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1670329 + ... + 5010985.

It is an arithmetic number, because the mean of its divisors is an integer number (3719997510769).

Almost surely, 2^{11159989191649} is an apocalyptic number.

11159989191649 is the 3340657-th square number.

11159989191649 is the 1670329-th centered octagonal number.

It is an amenable number.

11159989191649 is a deficient number, since it is larger than the sum of its proper divisors (3340658).

11159989191649 is an frugal number, since it uses more digits than its factorization.

11159989191649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6681314 (or 3340657 counting only the distinct ones).

The product of its digits is 56687040, while the sum is 73.

The spelling of 11159989191649 in words is "eleven trillion, one hundred fifty-nine billion, nine hundred eighty-nine million, one hundred ninety-one thousand, six hundred forty-nine".