1266055003 has 4 divisors (see below), whose sum is σ = 1267936888. Its totient is φ = 1264173120.

The previous prime is 1266054989. The next prime is 1266055019. The reversal of 1266055003 is 3005506621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1266055003 - 2⁵ = 1266054971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266055073) 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, 939933 + ... + 941278.

It is an arithmetic number, because the mean of its divisors is an integer number (316984222).

Almost surely, 2^1266055003 is an apocalyptic number.

1266055003 is a deficient number, since it is larger than the sum of its proper divisors (1881885).

1266055003 is an equidigital number, since it uses as much as digits as its factorization.

1266055003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881884.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 1266055003 is about 35581.6666697894. Note that the first 5 decimals coincide. The cubic root of 1266055003 is about 1081.8096668999.

The spelling of 1266055003 in words is "one billion, two hundred sixty-six million, fifty-five thousand, three".