1165406660 has 72 divisors (see below), whose sum is σ = 2699937240. Its totient is φ = 422231040.

The previous prime is 1165406659. The next prime is 1165406677. The reversal of 1165406660 is 666045611.

It can be written as a sum of positive squares in 4 ways, for example, as 4096576 + 1161310084 = 2024^2 + 34078^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1165406660.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 814826 + ... + 816254.

Almost surely, 2^1165406660 is an apocalyptic number.

1165406660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165406660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349968620).

1165406660 is an abundant number, since it is smaller than the sum of its proper divisors (1534530580).

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

1165406660 is a wasteful number, since it uses less digits than its factorization.

1165406660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797 (or 1784 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1165406660 is about 34138.0529614681. The cubic root of 1165406660 is about 1052.3474795116.

The spelling of 1165406660 in words is "one billion, one hundred sixty-five million, four hundred six thousand, six hundred sixty".