115561666000 has 80 divisors (see below), whose sum is σ = 304830721728. Its totient is φ = 42022416000.

The previous prime is 115561665959. The next prime is 115561666009. The reversal of 115561666000 is 666165511.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115561666009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2604402 + ... + 2648401.

Almost surely, 2^115561666000 is an apocalyptic number.

115561666000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115561666000 is an abundant number, since it is smaller than the sum of its proper divisors (189269055728).

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

115561666000 is a wasteful number, since it uses less digits than its factorization.

115561666000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252837 (or 5252821 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 115561666000 in words is "one hundred fifteen billion, five hundred sixty-one million, six hundred sixty-six thousand".