11777778965 has 8 divisors (see below), whose sum is σ = 14147806680. Its totient is φ = 9412575232.

The previous prime is 11777778949. The next prime is 11777778967. The reversal of 11777778965 is 56987777711.

It can be written as a sum of positive squares in 4 ways, for example, as 692426596 + 11085352369 = 26314^2 + 105287^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11777778965 - 2⁴ = 11777778949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11777778967) 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, 1200620 + ... + 1210389.

It is an arithmetic number, because the mean of its divisors is an integer number (1768475835).

Almost surely, 2^11777778965 is an apocalyptic number.

It is an amenable number.

11777778965 is a deficient number, since it is larger than the sum of its proper divisors (2370027715).

11777778965 is an equidigital number, since it uses as much as digits as its factorization.

11777778965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411991.

The product of its digits is 36303120, while the sum is 65.

The spelling of 11777778965 in words is "eleven billion, seven hundred seventy-seven million, seven hundred seventy-eight thousand, nine hundred sixty-five".