11661161555000 has 80 divisors (see below), whose sum is σ = 28760107101000. Its totient is φ = 4418966448000.

The previous prime is 11661161554927. The next prime is 11661161555011. The reversal of 11661161555000 is 55516116611.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

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 19 ways as a sum of consecutive naturals, for example, 61279535 + ... + 61469534.

Almost surely, 2^{11661161555000} is an apocalyptic number.

11661161555000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661161555000 is an abundant number, since it is smaller than the sum of its proper divisors (17098945546000).

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

11661161555000 is a wasteful number, since it uses less digits than its factorization.

11661161555000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122749114 (or 122749095 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 11661161555000 in words is "eleven trillion, six hundred sixty-one billion, one hundred sixty-one million, five hundred fifty-five thousand".