2172805775 has 18 divisors (see below), whose sum is σ = 3134163240. Its totient is φ = 1489923120.

The previous prime is 2172805769. The next prime is 2172805807. The reversal of 2172805775 is 5775082712.

2172805775 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 2172805775 - 2⁴ = 2172805759 is a prime.

It is a zygodrome in base 6.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 885635 + ... + 888084.

It is an arithmetic number, because the mean of its divisors is an integer number (174120180).

Almost surely, 2^2172805775 is an apocalyptic number.

2172805775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2172805775 is a deficient number, since it is larger than the sum of its proper divisors (961357465).

2172805775 is a wasteful number, since it uses less digits than its factorization.

2172805775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773743 (or 1773731 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 44.

The square root of 2172805775 is about 46613.3647680577. The cubic root of 2172805775 is about 1295.2103383690.

The spelling of 2172805775 in words is "two billion, one hundred seventy-two million, eight hundred five thousand, seven hundred seventy-five".