1165155000 has 160 divisors (see below), whose sum is σ = 3669138000. Its totient is φ = 308224000.

The previous prime is 1165154983. The next prime is 1165155001. The reversal of 1165155000 is 5515611.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165155001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2594776 + ... + 2595224.

Almost surely, 2^1165155000 is an apocalyptic number.

1165155000 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 1165155000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834569000).

1165155000 is an abundant number, since it is smaller than the sum of its proper divisors (2503983000).

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

1165155000 is a wasteful number, since it uses less digits than its factorization.

1165155000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 1165155000 is about 34134.3668463325. The cubic root of 1165155000 is about 1052.2717254591.

The spelling of 1165155000 in words is "one billion, one hundred sixty-five million, one hundred fifty-five thousand".