1165165100 has 72 divisors (see below), whose sum is σ = 2777166000. Its totient is φ = 420793600.

The previous prime is 1165165097. The next prime is 1165165117. The reversal of 1165165100 is 15615611.

It is a self number, because there is not a number n which added to its sum of digits gives 1165165100.

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, 160346 + ... + 167454.

It is an arithmetic number, because the mean of its divisors is an integer number (38571750).

Almost surely, 2^1165165100 is an apocalyptic number.

1165165100 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 1165165100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1388583000).

1165165100 is an abundant number, since it is smaller than the sum of its proper divisors (1612000900).

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

1165165100 is a wasteful number, since it uses less digits than its factorization.

1165165100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283 (or 7276 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1165165100 is about 34134.5147907510. The cubic root of 1165165100 is about 1052.2747659455.

The spelling of 1165165100 in words is "one billion, one hundred sixty-five million, one hundred sixty-five thousand, one hundred".