1166521659 has 32 divisors (see below), whose sum is σ = 1651113984. Its totient is φ = 731095200.

The previous prime is 1166521639. The next prime is 1166521669. The reversal of 1166521659 is 9561256611.

It is not a de Polignac number, because 1166521659 - 2⁸ = 1166521403 is a prime.

It is a super-2 number, since 2×1166521659² = 2721545561832224562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1166521659.

It is not an unprimeable number, because it can be changed into a prime (1166521639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1072614 + ... + 1073700.

It is an arithmetic number, because the mean of its divisors is an integer number (51597312).

Almost surely, 2^1166521659 is an apocalyptic number.

1166521659 is a deficient number, since it is larger than the sum of its proper divisors (484592325).

1166521659 is a wasteful number, since it uses less digits than its factorization.

1166521659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367.

The product of its digits is 97200, while the sum is 42.

The square root of 1166521659 is about 34154.3797923487. The cubic root of 1166521659 is about 1052.6829825372.

The spelling of 1166521659 in words is "one billion, one hundred sixty-six million, five hundred twenty-one thousand, six hundred fifty-nine".