2173256765 has 16 divisors (see below), whose sum is σ = 2809012800. Its totient is φ = 1608792192.

The previous prime is 2173256759. The next prime is 2173256791. The reversal of 2173256765 is 5676523712.

It is a cyclic number.

It is not a de Polignac number, because 2173256765 - 2⁸ = 2173256509 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261920 + ... + 270089.

It is an arithmetic number, because the mean of its divisors is an integer number (175563300).

Almost surely, 2^2173256765 is an apocalyptic number.

It is an amenable number.

2173256765 is a deficient number, since it is larger than the sum of its proper divisors (635756035).

2173256765 is a wasteful number, since it uses less digits than its factorization.

2173256765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532076.

The product of its digits is 529200, while the sum is 44.

The square root of 2173256765 is about 46618.2020781583. The cubic root of 2173256765 is about 1295.2999439392.

The spelling of 2173256765 in words is "two billion, one hundred seventy-three million, two hundred fifty-six thousand, seven hundred sixty-five".