11778261984 has 36 divisors (see below), whose sum is σ = 33494433336. Its totient is φ = 3926087232.

The previous prime is 11778261977. The next prime is 11778262021. The reversal of 11778261984 is 48916287711.

11778261984 is a `hidden beast` number, since 1 + 17 + 7 + 8 + 2 + 619 + 8 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 11778261984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20448084 + ... + 20448659.

It is an arithmetic number, because the mean of its divisors is an integer number (930400926).

Almost surely, 2^11778261984 is an apocalyptic number.

It is an amenable number.

11778261984 is an abundant number, since it is smaller than the sum of its proper divisors (21716171352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11778261984 is a wasteful number, since it uses less digits than its factorization.

11778261984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40896759 (or 40896748 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The spelling of 11778261984 in words is "eleven billion, seven hundred seventy-eight million, two hundred sixty-one thousand, nine hundred eighty-four".