1666503234 has 144 divisors (see below), whose sum is σ = 4360565664. Its totient is φ = 475009920.

The previous prime is 1666503211. The next prime is 1666503247. The reversal of 1666503234 is 4323056661.

It is a super-3 number, since 3×1666503234³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 998869 + ... + 1000535.

It is an arithmetic number, because the mean of its divisors is an integer number (30281706).

Almost surely, 2^1666503234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666503234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2180282832).

1666503234 is an abundant number, since it is smaller than the sum of its proper divisors (2694062430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666503234 is a wasteful number, since it uses less digits than its factorization.

1666503234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 1666503234 is about 40822.8273641109. The cubic root of 1666503234 is about 1185.5923460594.

Adding to 1666503234 its reverse (4323056661), we get a palindrome (5989559895).

The spelling of 1666503234 in words is "one billion, six hundred sixty-six million, five hundred three thousand, two hundred thirty-four".