1165643660 has 24 divisors (see below), whose sum is σ = 2448519360. Its totient is φ = 466130304.

The previous prime is 1165643659. The next prime is 1165643701. The reversal of 1165643660 is 663465611.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109661 + ... + 119819.

It is an arithmetic number, because the mean of its divisors is an integer number (102021640).

Almost surely, 2^1165643660 is an apocalyptic number.

1165643660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165643660 is an abundant number, since it is smaller than the sum of its proper divisors (1282875700).

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

1165643660 is a wasteful number, since it uses less digits than its factorization.

1165643660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15905 (or 15903 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1165643660 is about 34141.5239847316. The cubic root of 1165643660 is about 1052.4188106777.

The spelling of 1165643660 in words is "one billion, one hundred sixty-five million, six hundred forty-three thousand, six hundred sixty".