11661440793878 has 16 divisors (see below), whose sum is σ = 17497938895056. Its totient is φ = 5828794810080.

The previous prime is 11661440793869. The next prime is 11661440793889. The reversal of 11661440793878 is 87839704416611.

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, 80796125 + ... + 80940327.

It is an arithmetic number, because the mean of its divisors is an integer number (1093621180941).

Almost surely, 2^{11661440793878} is an apocalyptic number.

11661440793878 is a deficient number, since it is larger than the sum of its proper divisors (5836498101178).

11661440793878 is a wasteful number, since it uses less digits than its factorization.

11661440793878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157279.

The product of its (nonzero) digits is 48771072, while the sum is 65.

The spelling of 11661440793878 in words is "eleven trillion, six hundred sixty-one billion, four hundred forty million, seven hundred ninety-three thousand, eight hundred seventy-eight".