1666304145025 has 24 divisors (see below), whose sum is σ = 2225248684344. Its totient is φ = 1230450777600.

The previous prime is 1666304145013. The next prime is 1666304145089. The reversal of 1666304145025 is 5205414036661.

It can be written as a sum of positive squares in 12 ways, for example, as 364623953281 + 1301680191744 = 603841^2 + 1140912^2 .

It is not a de Polignac number, because 1666304145025 - 2¹⁵ = 1666304112257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8989077 + ... + 9172573.

It is an arithmetic number, because the mean of its divisors is an integer number (92718695181).

Almost surely, 2^{1666304145025} is an apocalyptic number.

It is an amenable number.

1666304145025 is a deficient number, since it is larger than the sum of its proper divisors (558944539319).

1666304145025 is a wasteful number, since it uses less digits than its factorization.

1666304145025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211461 (or 211456 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 1666304145025 in words is "one trillion, six hundred sixty-six billion, three hundred four million, one hundred forty-five thousand, twenty-five".