16189191965 has 8 divisors (see below), whose sum is σ = 20449505760. Its totient is φ = 12269703312.

The previous prime is 16189191961. The next prime is 16189192057. The reversal of 16189191965 is 56919198161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16189191965 - 2² = 16189191961 is a prime.

It is a super-2 number, since 2×16189191965² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16189191965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16189191961) 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, 85206179 + ... + 85206368.

It is an arithmetic number, because the mean of its divisors is an integer number (2556188220).

Almost surely, 2^16189191965 is an apocalyptic number.

It is an amenable number.

16189191965 is a deficient number, since it is larger than the sum of its proper divisors (4260313795).

16189191965 is a wasteful number, since it uses less digits than its factorization.

16189191965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170412571.

The product of its digits is 1049760, while the sum is 56.

It can be divided in two parts, 16 and 189191965, that added together give a palindrome (189191981).

The spelling of 16189191965 in words is "sixteen billion, one hundred eighty-nine million, one hundred ninety-one thousand, nine hundred sixty-five".