1165211264 has 64 divisors (see below), whose sum is σ = 2696553600. Its totient is φ = 491166720.

The previous prime is 1165211209. The next prime is 1165211269. The reversal of 1165211264 is 4621125611.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1165211269) 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, 43997 + ... + 65315.

It is an arithmetic number, because the mean of its divisors is an integer number (42133650).

Almost surely, 2^1165211264 is an apocalyptic number.

1165211264 is a gapful number since it is divisible by the number (14) 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 1165211264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1348276800).

1165211264 is an abundant number, since it is smaller than the sum of its proper divisors (1531342336).

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

1165211264 is an equidigital number, since it uses as much as digits as its factorization.

1165211264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21401 (or 21389 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1165211264 is about 34135.1909911165. The cubic root of 1165211264 is about 1052.2886628518.

Adding to 1165211264 its reverse (4621125611), we get a palindrome (5786336875).

The spelling of 1165211264 in words is "one billion, one hundred sixty-five million, two hundred eleven thousand, two hundred sixty-four".