11978581540 has 24 divisors (see below), whose sum is σ = 26478970560. Its totient is φ = 4539251808.

The previous prime is 11978581513. The next prime is 11978581541. The reversal of 11978581540 is 4518587911.

11978581540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (11978581541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15760912 + ... + 15761671.

It is an arithmetic number, because the mean of its divisors is an integer number (1103290440).

Almost surely, 2^11978581540 is an apocalyptic number.

11978581540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11978581540 is an abundant number, since it is smaller than the sum of its proper divisors (14500389020).

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

11978581540 is a wasteful number, since it uses less digits than its factorization.

11978581540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31522611 (or 31522609 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 49.

The spelling of 11978581540 in words is "eleven billion, nine hundred seventy-eight million, five hundred eighty-one thousand, five hundred forty".