2180661833 has 4 divisors (see below), whose sum is σ = 2492184960. Its totient is φ = 1869138708.

The previous prime is 2180661823. The next prime is 2180661851. The reversal of 2180661833 is 3381660812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2180661833 - 2¹² = 2180657737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2180661803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155761553 + ... + 155761566.

It is an arithmetic number, because the mean of its divisors is an integer number (623046240).

Almost surely, 2^2180661833 is an apocalyptic number.

It is an amenable number.

2180661833 is a deficient number, since it is larger than the sum of its proper divisors (311523127).

2180661833 is an equidigital number, since it uses as much as digits as its factorization.

2180661833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311523126.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 2180661833 is about 46697.5570346030. The cubic root of 2180661833 is about 1296.7694605152.

The spelling of 2180661833 in words is "two billion, one hundred eighty million, six hundred sixty-one thousand, eight hundred thirty-three".