11717211165 has 16 divisors (see below), whose sum is σ = 20451859776. Its totient is φ = 5681072000.

The previous prime is 11717211157. The next prime is 11717211167. The reversal of 11717211165 is 56111271711.

It is not a de Polignac number, because 11717211165 - 2³ = 11717211157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11717211167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35506536 + ... + 35506865.

It is an arithmetic number, because the mean of its divisors is an integer number (1278241236).

Almost surely, 2^11717211165 is an apocalyptic number.

11717211165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11717211165 is a deficient number, since it is larger than the sum of its proper divisors (8734648611).

11717211165 is a wasteful number, since it uses less digits than its factorization.

11717211165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71013420.

The product of its digits is 2940, while the sum is 33.

Adding to 11717211165 its reverse (56111271711), we get a palindrome (67828482876).

The spelling of 11717211165 in words is "eleven billion, seven hundred seventeen million, two hundred eleven thousand, one hundred sixty-five".