1266125555 has 8 divisors (see below), whose sum is σ = 1520311632. Its totient is φ = 1012259808.

The previous prime is 1266125537. The next prime is 1266125557. The reversal of 1266125555 is 5555216621.

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 1266125555 - 2⁶ = 1266125491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266125557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71297 + ... + 87266.

It is an arithmetic number, because the mean of its divisors is an integer number (190038954).

Almost surely, 2^1266125555 is an apocalyptic number.

1266125555 is a deficient number, since it is larger than the sum of its proper divisors (254186077).

1266125555 is a wasteful number, since it uses less digits than its factorization.

1266125555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160165.

The product of its digits is 90000, while the sum is 38.

The square root of 1266125555 is about 35582.6580654116. The cubic root of 1266125555 is about 1081.8297614502.

The spelling of 1266125555 in words is "one billion, two hundred sixty-six million, one hundred twenty-five thousand, five hundred fifty-five".