11781804166 has 16 divisors (see below), whose sum is σ = 19305861120. Its totient is φ = 5347991880.

The previous prime is 11781804149. The next prime is 11781804173. The reversal of 11781804166 is 66140818711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352326 + ... + 384313.

It is an arithmetic number, because the mean of its divisors is an integer number (1206616320).

Almost surely, 2^11781804166 is an apocalyptic number.

11781804166 is a deficient number, since it is larger than the sum of its proper divisors (7524056954).

11781804166 is a wasteful number, since it uses less digits than its factorization.

11781804166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737379.

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 11781804166 in words is "eleven billion, seven hundred eighty-one million, eight hundred four thousand, one hundred sixty-six".