1165660911 has 12 divisors (see below), whose sum is σ = 1686020440. Its totient is φ = 776051280.

The previous prime is 1165660891. The next prime is 1165660921. The reversal of 1165660911 is 1190665611.

1165660911 is a `hidden beast` number, since 1 + 1 + 6 + 566 + 0 + 91 + 1 = 666.

It is not a de Polignac number, because 1165660911 - 2¹⁴ = 1165644527 is a prime.

It is a super-3 number, since 3×1165660911³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165660921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80980 + ... + 94281.

Almost surely, 2^1165660911 is an apocalyptic number.

1165660911 is a deficient number, since it is larger than the sum of its proper divisors (520359529).

1165660911 is a wasteful number, since it uses less digits than its factorization.

1165660911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176006 (or 176003 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1165660911 is about 34141.7766233686. The cubic root of 1165660911 is about 1052.4240024265.

The spelling of 1165660911 in words is "one billion, one hundred sixty-five million, six hundred sixty thousand, nine hundred eleven".