2159805757 has 8 divisors (see below), whose sum is σ = 2173876056. Its totient is φ = 2145767232.

The previous prime is 2159805751. The next prime is 2159805797. The reversal of 2159805757 is 7575089512.

It can be written as a sum of positive squares in 4 ways, for example, as 1332323001 + 827482756 = 36501^2 + 28766^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2159805757 - 2⁷ = 2159805629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2159805757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159805751) 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 7 ways as a sum of consecutive naturals, for example, 136923 + ... + 151879.

It is an arithmetic number, because the mean of its divisors is an integer number (271734507).

Almost surely, 2^2159805757 is an apocalyptic number.

It is an amenable number.

2159805757 is a deficient number, since it is larger than the sum of its proper divisors (14070299).

2159805757 is a wasteful number, since it uses less digits than its factorization.

2159805757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15887.

The product of its (nonzero) digits is 882000, while the sum is 49.

The square root of 2159805757 is about 46473.7103855502. The cubic root of 2159805757 is about 1292.6220643522.

The spelling of 2159805757 in words is "two billion, one hundred fifty-nine million, eight hundred five thousand, seven hundred fifty-seven".