1666436325 has 48 divisors (see below), whose sum is σ = 2908147200. Its totient is φ = 839678400.

The previous prime is 1666436323. The next prime is 1666436327. The reversal of 1666436325 is 5236346661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1666436323) and next prime (1666436327).

It is not a de Polignac number, because 1666436325 - 2¹ = 1666436323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666436323) 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 47 ways as a sum of consecutive naturals, for example, 595680 + ... + 598470.

It is an arithmetic number, because the mean of its divisors is an integer number (60586400).

Almost surely, 2^1666436325 is an apocalyptic number.

1666436325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666436325 is a deficient number, since it is larger than the sum of its proper divisors (1241710875).

1666436325 is a wasteful number, since it uses less digits than its factorization.

1666436325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242 (or 3237 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The square root of 1666436325 is about 40822.0078511579. The cubic root of 1666436325 is about 1185.5764789314.

The spelling of 1666436325 in words is "one billion, six hundred sixty-six million, four hundred thirty-six thousand, three hundred twenty-five".