2153781755 has 32 divisors (see below), whose sum is σ = 2746068480. Its totient is φ = 1618341120.

The previous prime is 2153781743. The next prime is 2153781769. The reversal of 2153781755 is 5571873512.

It is not a de Polignac number, because 2153781755 - 2¹⁴ = 2153765371 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1667660 + ... + 1668950.

It is an arithmetic number, because the mean of its divisors is an integer number (85814640).

Almost surely, 2^2153781755 is an apocalyptic number.

2153781755 is a deficient number, since it is larger than the sum of its proper divisors (592286725).

2153781755 is a wasteful number, since it uses less digits than its factorization.

2153781755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571.

The product of its digits is 294000, while the sum is 44.

The square root of 2153781755 is about 46408.8542737267. The cubic root of 2153781755 is about 1291.4191770758.

The spelling of 2153781755 in words is "two billion, one hundred fifty-three million, seven hundred eighty-one thousand, seven hundred fifty-five".