1666503265 has 16 divisors (see below), whose sum is σ = 2290717440. Its totient is φ = 1140131520.

The previous prime is 1666503257. The next prime is 1666503277. The reversal of 1666503265 is 5623056661.

It is a happy number.

1666503265 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1666503265 - 2³ = 1666503257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38866 + ... + 69595.

It is an arithmetic number, because the mean of its divisors is an integer number (143169840).

Almost surely, 2^1666503265 is an apocalyptic number.

It is an amenable number.

1666503265 is a deficient number, since it is larger than the sum of its proper divisors (624214175).

1666503265 is a wasteful number, since it uses less digits than its factorization.

1666503265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108912.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 1666503265 is about 40822.8277438004. The cubic root of 1666503265 is about 1185.5923534108.

The spelling of 1666503265 in words is "one billion, six hundred sixty-six million, five hundred three thousand, two hundred sixty-five".