11791561765 has 8 divisors (see below), whose sum is σ = 14162480928. Its totient is φ = 9424844880.

The previous prime is 11791561759. The next prime is 11791561787. The reversal of 11791561765 is 56716519711.

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

It is not a de Polignac number, because 11791561765 - 2¹⁹ = 11791037477 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1044391 + ... + 1055620.

It is an arithmetic number, because the mean of its divisors is an integer number (1770310116).

Almost surely, 2^11791561765 is an apocalyptic number.

It is an amenable number.

11791561765 is a deficient number, since it is larger than the sum of its proper divisors (2370919163).

11791561765 is a wasteful number, since it uses less digits than its factorization.

11791561765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101139.

The product of its digits is 396900, while the sum is 49.

The spelling of 11791561765 in words is "eleven billion, seven hundred ninety-one million, five hundred sixty-one thousand, seven hundred sixty-five".