1166660111505 has 64 divisors (see below), whose sum is σ = 2228114350080. Its totient is φ = 510120716544.

The previous prime is 1166660111489. The next prime is 1166660111509. The reversal of 1166660111505 is 5051110666611.

It is not a de Polignac number, because 1166660111505 - 2⁴ = 1166660111489 is a prime.

It is a super-2 number, since 2×1166660111505² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1166660111509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2315689 + ... + 2774118.

It is an arithmetic number, because the mean of its divisors is an integer number (34814286720).

Almost surely, 2^{1166660111505} is an apocalyptic number.

1166660111505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166660111505 is a deficient number, since it is larger than the sum of its proper divisors (1061454238575).

1166660111505 is a wasteful number, since it uses less digits than its factorization.

1166660111505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089918.

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

The spelling of 1166660111505 in words is "one trillion, one hundred sixty-six billion, six hundred sixty million, one hundred eleven thousand, five hundred five".