1666664325 has 72 divisors (see below), whose sum is σ = 3159842400. Its totient is φ = 837406080.

The previous prime is 1666664323. The next prime is 1666664333. The reversal of 1666664325 is 5234666661.

It is not a de Polignac number, because 1666664325 - 2¹ = 1666664323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666664323) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 841186 + ... + 843164.

It is an arithmetic number, because the mean of its divisors is an integer number (43886700).

Almost surely, 2^1666664325 is an apocalyptic number.

1666664325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666664325 is a deficient number, since it is larger than the sum of its proper divisors (1493178075).

1666664325 is a wasteful number, since it uses less digits than its factorization.

1666664325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211 (or 2203 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 1666664325 is about 40824.8003669338. The cubic root of 1666664325 is about 1185.6305462259.

The spelling of 1666664325 in words is "one billion, six hundred sixty-six million, six hundred sixty-four thousand, three hundred twenty-five".