1165957785 has 24 divisors (see below), whose sum is σ = 2051162880. Its totient is φ = 612561312.

The previous prime is 1165957783. The next prime is 1165957829. The reversal of 1165957785 is 5877595611.

It is a happy number.

1165957785 is a `hidden beast` number, since 1 + 1 + 65 + 9 + 577 + 8 + 5 = 666.

It is not a de Polignac number, because 1165957785 - 2¹ = 1165957783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165957783) 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 23 ways as a sum of consecutive naturals, for example, 190345 + ... + 196374.

It is an arithmetic number, because the mean of its divisors is an integer number (85465120).

Almost surely, 2^1165957785 is an apocalyptic number.

1165957785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1165957785 is a deficient number, since it is larger than the sum of its proper divisors (885205095).

1165957785 is a wasteful number, since it uses less digits than its factorization.

1165957785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386797 (or 386794 counting only the distinct ones).

The product of its digits is 2646000, while the sum is 54.

The square root of 1165957785 is about 34146.1240113721. The cubic root of 1165957785 is about 1052.5133396714.

The spelling of 1165957785 in words is "one billion, one hundred sixty-five million, nine hundred fifty-seven thousand, seven hundred eighty-five".