1255540666 has 8 divisors (see below), whose sum is σ = 1883483604. Its totient is φ = 627712800.

The previous prime is 1255540633. The next prime is 1255540667. The reversal of 1255540666 is 6660455521.

It can be written as a sum of positive squares in 2 ways, for example, as 1198613641 + 56927025 = 34621^2 + 7545^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1255540667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7816 + ... + 50716.

Almost surely, 2^1255540666 is an apocalyptic number.

1255540666 is a deficient number, since it is larger than the sum of its proper divisors (627942938).

1255540666 is a wasteful number, since it uses less digits than its factorization.

1255540666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57536.

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 1255540666 is about 35433.6092714248. The cubic root of 1255540666 is about 1078.8065995876.

The spelling of 1255540666 in words is "one billion, two hundred fifty-five million, five hundred forty thousand, six hundred sixty-six".