1666201503 has 16 divisors (see below), whose sum is σ = 2233478016. Its totient is φ = 1104876000.

The previous prime is 1666201499. The next prime is 1666201529. The reversal of 1666201503 is 3051026661.

It is not a de Polignac number, because 1666201503 - 2² = 1666201499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666201543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983325 + ... + 985017.

It is an arithmetic number, because the mean of its divisors is an integer number (139592376).

Almost surely, 2^1666201503 is an apocalyptic number.

1666201503 is a deficient number, since it is larger than the sum of its proper divisors (567276513).

1666201503 is a wasteful number, since it uses less digits than its factorization.

1666201503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1666201503 is about 40819.1315806694. The cubic root of 1666201503 is about 1185.5207887313.

The spelling of 1666201503 in words is "one billion, six hundred sixty-six million, two hundred one thousand, five hundred three".