1166510161555 has 32 divisors (see below), whose sum is σ = 1442687500800. Its totient is φ = 904907001600.

The previous prime is 1166510161511. The next prime is 1166510161571. The reversal of 1166510161555 is 5551610156611.

It is not a de Polignac number, because 1166510161555 - 2⁹ = 1166510161043 is a prime.

It is a super-2 number, since 2×1166510161555² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85822810 + ... + 85836400.

It is an arithmetic number, because the mean of its divisors is an integer number (45083984400).

Almost surely, 2^{1166510161555} is an apocalyptic number.

1166510161555 is a deficient number, since it is larger than the sum of its proper divisors (276177339245).

1166510161555 is a wasteful number, since it uses less digits than its factorization.

1166510161555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16155.

The product of its (nonzero) digits is 135000, while the sum is 43.

The spelling of 1166510161555 in words is "one trillion, one hundred sixty-six billion, five hundred ten million, one hundred sixty-one thousand, five hundred fifty-five".