1166555642508 has 18 divisors (see below), whose sum is σ = 2948793429764. Its totient is φ = 388851880824.

The previous prime is 1166555642501. The next prime is 1166555642519. The reversal of 1166555642508 is 8052465556611.

1166555642508 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 55 + 564 + 25 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1166555642501) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 16202161666 + ... + 16202161737.

Almost surely, 2^{1166555642508} is an apocalyptic number.

1166555642508 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1166555642508 is an abundant number, since it is smaller than the sum of its proper divisors (1782237787256).

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

1166555642508 is a wasteful number, since it uses less digits than its factorization.

1166555642508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32404323413 (or 32404323408 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 54.

The spelling of 1166555642508 in words is "one trillion, one hundred sixty-six billion, five hundred fifty-five million, six hundred forty-two thousand, five hundred eight".