1266120055 has 8 divisors (see below), whose sum is σ = 1521850752. Its totient is φ = 1011224928.

The previous prime is 1266120047. The next prime is 1266120083. The reversal of 1266120055 is 5500216621.

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

It is a cyclic number.

It is not a de Polignac number, because 1266120055 - 2³ = 1266120047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205552 + ... + 211621.

It is an arithmetic number, because the mean of its divisors is an integer number (190231344).

Almost surely, 2^1266120055 is an apocalyptic number.

1266120055 is a deficient number, since it is larger than the sum of its proper divisors (255730697).

1266120055 is an equidigital number, since it uses as much as digits as its factorization.

1266120055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417785.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1266120055 is about 35582.5807804886. The cubic root of 1266120055 is about 1081.8281949725.

Adding to 1266120055 its reverse (5500216621), we get a palindrome (6766336676).

The spelling of 1266120055 in words is "one billion, two hundred sixty-six million, one hundred twenty thousand, fifty-five".