1165501661166 has 24 divisors (see below), whose sum is σ = 2612331310680. Its totient is φ = 375103982736.

The previous prime is 1165501661161. The next prime is 1165501661249. The reversal of 1165501661166 is 6611661055611.

1165501661166 is a `hidden beast` number, since 1 + 16 + 5 + 5 + 0 + 16 + 611 + 6 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165501661161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1116380380 + ... + 1116381423.

It is an arithmetic number, because the mean of its divisors is an integer number (108847137945).

Almost surely, 2^{1165501661166} is an apocalyptic number.

1165501661166 is an abundant number, since it is smaller than the sum of its proper divisors (1446829649514).

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

1165501661166 is a wasteful number, since it uses less digits than its factorization.

1165501661166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232761840 (or 2232761837 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 1165501661166 in words is "one trillion, one hundred sixty-five billion, five hundred one million, six hundred sixty-one thousand, one hundred sixty-six".