2188135669 has 4 divisors (see below), whose sum is σ = 2189850444. Its totient is φ = 2186420896.

The previous prime is 2188135667. The next prime is 2188135673. The reversal of 2188135669 is 9665318812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1976869444 + 211266225 = 44462^2 + 14535^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188135669 - 2¹ = 2188135667 is a prime.

It is a super-2 number, since 2×2188135669² = 9575875411900155122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188135667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855472 + ... + 858025.

It is an arithmetic number, because the mean of its divisors is an integer number (547462611).

Almost surely, 2^2188135669 is an apocalyptic number.

It is an amenable number.

2188135669 is a deficient number, since it is larger than the sum of its proper divisors (1714775).

2188135669 is a wasteful number, since it uses less digits than its factorization.

2188135669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714774.

The product of its digits is 622080, while the sum is 49.

The square root of 2188135669 is about 46777.5124285163. The cubic root of 2188135669 is about 1298.2492545243.

The spelling of 2188135669 in words is "two billion, one hundred eighty-eight million, one hundred thirty-five thousand, six hundred sixty-nine".