219868991161 has 8 divisors (see below), whose sum is σ = 225337135464. Its totient is φ = 214405870080.

The previous prime is 219868991123. The next prime is 219868991213. The reversal of 219868991161 is 161199868912.

It can be written as a sum of positive squares in 4 ways, for example, as 339259561 + 219529731600 = 18419^2 + 468540^2 .

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 219868991161 - 2¹¹ = 219868989113 is a prime.

It is a super-2 number, since 2×219868991161² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 219868991161.

It is not an unprimeable number, because it can be changed into a prime (219868998161) 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, 1167100 + ... + 1342333.

It is an arithmetic number, because the mean of its divisors is an integer number (28167141933).

Almost surely, 2^219868991161 is an apocalyptic number.

It is an amenable number.

219868991161 is a deficient number, since it is larger than the sum of its proper divisors (5468144303).

219868991161 is a wasteful number, since it uses less digits than its factorization.

219868991161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511611.

The product of its digits is 3359232, while the sum is 61.

The spelling of 219868991161 in words is "two hundred nineteen billion, eight hundred sixty-eight million, nine hundred ninety-one thousand, one hundred sixty-one".