2129611667 has 4 divisors (see below), whose sum is σ = 2165706840. Its totient is φ = 2093516496.

The previous prime is 2129611661. The next prime is 2129611697. The reversal of 2129611667 is 7661169212.

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

It is a cyclic number.

It is not a de Polignac number, because 2129611667 - 2⁸ = 2129611411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129611661) 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, 18047498 + ... + 18047615.

It is an arithmetic number, because the mean of its divisors is an integer number (541426710).

Almost surely, 2^2129611667 is an apocalyptic number.

2129611667 is a deficient number, since it is larger than the sum of its proper divisors (36095173).

2129611667 is an equidigital number, since it uses as much as digits as its factorization.

2129611667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36095172.

The product of its digits is 54432, while the sum is 41.

The square root of 2129611667 is about 46147.7157289502. The cubic root of 2129611667 is about 1286.5701542939.

The spelling of 2129611667 in words is "two billion, one hundred twenty-nine million, six hundred eleven thousand, six hundred sixty-seven".