11561377849 has 8 divisors (see below), whose sum is σ = 13908424640. Its totient is φ = 9388186416.

The previous prime is 11561377831. The next prime is 11561377853. The reversal of 11561377849 is 94877316511.

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

It is not a de Polignac number, because 11561377849 - 2⁷ = 11561377721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11561377796 and 11561377805.

It is not an unprimeable number, because it can be changed into a prime (11561375849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43463694 + ... + 43463959.

It is an arithmetic number, because the mean of its divisors is an integer number (1738553080).

Almost surely, 2^11561377849 is an apocalyptic number.

11561377849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11561377849 is a deficient number, since it is larger than the sum of its proper divisors (2347046791).

11561377849 is an equidigital number, since it uses as much as digits as its factorization.

11561377849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86927679.

The product of its digits is 1270080, while the sum is 52.

The spelling of 11561377849 in words is "eleven billion, five hundred sixty-one million, three hundred seventy-seven thousand, eight hundred forty-nine".