1166605515 has 24 divisors (see below), whose sum is σ = 2024747088. Its totient is φ = 621380160.

The previous prime is 1166605499. The next prime is 1166605519. The reversal of 1166605515 is 5155066611.

It is not a de Polignac number, because 1166605515 - 2⁴ = 1166605499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1166605515.

It is not an unprimeable number, because it can be changed into a prime (1166605519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18945 + ... + 51885.

It is an arithmetic number, because the mean of its divisors is an integer number (84364462).

Almost surely, 2^1166605515 is an apocalyptic number.

1166605515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1166605515 is a deficient number, since it is larger than the sum of its proper divisors (858141573).

1166605515 is a wasteful number, since it uses less digits than its factorization.

1166605515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33739 (or 33736 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1166605515 is about 34155.6073727287. The cubic root of 1166605515 is about 1052.7082061491.

The spelling of 1166605515 in words is "one billion, one hundred sixty-six million, six hundred five thousand, five hundred fifteen".