2166256753 has 4 divisors (see below), whose sum is σ = 2166409728. Its totient is φ = 2166103780.

The previous prime is 2166256717. The next prime is 2166256783. The reversal of 2166256753 is 3576526612.

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 2166256753 - 2⁹ = 2166256241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166256783) 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, 52801 + ... + 84382.

It is an arithmetic number, because the mean of its divisors is an integer number (541602432).

Almost surely, 2^2166256753 is an apocalyptic number.

It is an amenable number.

2166256753 is a deficient number, since it is larger than the sum of its proper divisors (152975).

2166256753 is a wasteful number, since it uses less digits than its factorization.

2166256753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152974.

The product of its digits is 453600, while the sum is 43.

The square root of 2166256753 is about 46543.0634251765. The cubic root of 2166256753 is about 1293.9077372830.

The spelling of 2166256753 in words is "two billion, one hundred sixty-six million, two hundred fifty-six thousand, seven hundred fifty-three".