1165615616 has 80 divisors (see below), whose sum is σ = 2579433120. Its totient is φ = 521748480.

The previous prime is 1165615613. The next prime is 1165615621. The reversal of 1165615616 is 6165165611.

It is a self number, because there is not a number n which added to its sum of digits gives 1165615616.

It is not an unprimeable number, because it can be changed into a prime (1165615613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375800 + ... + 378888.

It is an arithmetic number, because the mean of its divisors is an integer number (32242914).

Almost surely, 2^1165615616 is an apocalyptic number.

1165615616 is a gapful number since it is divisible by the number (16) 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 1165615616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1289716560).

1165615616 is an abundant number, since it is smaller than the sum of its proper divisors (1413817504).

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

1165615616 is an equidigital number, since it uses as much as digits as its factorization.

1165615616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185 (or 3169 counting only the distinct ones).

The product of its digits is 32400, while the sum is 38.

The square root of 1165615616 is about 34141.1132800323. The cubic root of 1165615616 is about 1052.4103706284.

It can be divided in two parts, 11656 and 15616, that added together give a palindrome (27272).

The spelling of 1165615616 in words is "one billion, one hundred sixty-five million, six hundred fifteen thousand, six hundred sixteen".