1255840566 has 48 divisors (see below), whose sum is σ = 2606887152. Its totient is φ = 403307520.

The previous prime is 1255840559. The next prime is 1255840567. The reversal of 1255840566 is 6650485521.

It is a super-2 number, since 2×1255840566² = 3154271054422400712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255840567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2035090 + ... + 2035706.

It is an arithmetic number, because the mean of its divisors is an integer number (54310149).

Almost surely, 2^1255840566 is an apocalyptic number.

1255840566 is an abundant number, since it is smaller than the sum of its proper divisors (1351046586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1255840566 is a wasteful number, since it uses less digits than its factorization.

1255840566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1006 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 1255840566 is about 35437.8408766674. The cubic root of 1255840566 is about 1078.8924877768.

The spelling of 1255840566 in words is "one billion, two hundred fifty-five million, eight hundred forty thousand, five hundred sixty-six".