11161665 has 32 divisors (see below), whose sum is σ = 20534400. Its totient is φ = 5745600.

The previous prime is 11161663. The next prime is 11161681. The reversal of 11161665 is 56616111.

It is not a de Polignac number, because 11161665 - 2¹ = 11161663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11161663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2490 + ... + 5340.

It is an arithmetic number, because the mean of its divisors is an integer number (641700).

Almost surely, 2^11161665 is an apocalyptic number.

11161665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11161665 is a deficient number, since it is larger than the sum of its proper divisors (9372735).

11161665 is a wasteful number, since it uses less digits than its factorization.

11161665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894 (or 2888 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 11161665 is about 3340.9078107604. The cubic root of 11161665 is about 223.4822291172.

Adding to 11161665 its reverse (56616111), we get a palindrome (67777776).

It can be divided in two parts, 111 and 61665, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 11161665 in words is "eleven million, one hundred sixty-one thousand, six hundred sixty-five".