11661161605500 has 96 divisors (see below), whose sum is σ = 37044330156288. Its totient is φ = 2826948264000.

The previous prime is 11661161605459. The next prime is 11661161605519. The reversal of 11661161605500 is 550616116611.

11661161605500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353352034 + ... + 353385033.

It is an arithmetic number, because the mean of its divisors is an integer number (385878439128).

Almost surely, 2^{11661161605500} is an apocalyptic number.

11661161605500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661161605500 is an abundant number, since it is smaller than the sum of its proper divisors (25383168550788).

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

11661161605500 is a wasteful number, since it uses less digits than its factorization.

11661161605500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706737100 (or 706737088 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 11661161605500 in words is "eleven trillion, six hundred sixty-one billion, one hundred sixty-one million, six hundred five thousand, five hundred".