2105781255 has 12 divisors (see below), whose sum is σ = 3650020920. Its totient is φ = 1123083312.

The previous prime is 2105781253. The next prime is 2105781269. The reversal of 2105781255 is 5521875012.

2105781255 is a `hidden beast` number, since 21 + 0 + 578 + 12 + 55 = 666.

It is not a de Polignac number, because 2105781255 - 2¹ = 2105781253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105781253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23397525 + ... + 23397614.

It is an arithmetic number, because the mean of its divisors is an integer number (304168410).

Almost surely, 2^2105781255 is an apocalyptic number.

2105781255 is a deficient number, since it is larger than the sum of its proper divisors (1544239665).

2105781255 is a wasteful number, since it uses less digits than its factorization.

2105781255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46795150 (or 46795147 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The square root of 2105781255 is about 45888.7922591127. The cubic root of 2105781255 is about 1281.7532239261.

The spelling of 2105781255 in words is "two billion, one hundred five million, seven hundred eighty-one thousand, two hundred fifty-five".