1855256266 has 16 divisors (see below), whose sum is σ = 2884753440. Its totient is φ = 893803120.

The previous prime is 1855256243. The next prime is 1855256267. The reversal of 1855256266 is 6626525581.

It is not an unprimeable number, because it can be changed into a prime (1855256267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4096 + ... + 61051.

It is an arithmetic number, because the mean of its divisors is an integer number (180297090).

Almost surely, 2^1855256266 is an apocalyptic number.

1855256266 is a deficient number, since it is larger than the sum of its proper divisors (1029497174).

1855256266 is a wasteful number, since it uses less digits than its factorization.

1855256266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65669.

The product of its digits is 864000, while the sum is 46.

The square root of 1855256266 is about 43072.6858461369. The cubic root of 1855256266 is about 1228.7625570156.

It can be divided in two parts, 1855 and 256266, that added together give a triangular number (258121 = T₇₁₈).

The spelling of 1855256266 in words is "one billion, eight hundred fifty-five million, two hundred fifty-six thousand, two hundred sixty-six".