1666250040305 has 16 divisors (see below), whose sum is σ = 2010639115584. Its totient is φ = 1325594591040.

The previous prime is 1666250040277. The next prime is 1666250040307. The reversal of 1666250040305 is 5030400526661.

It is a happy number.

It is not a de Polignac number, because 1666250040305 - 2²⁸ = 1665981604849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666250040307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640211 + ... + 1934520.

It is an arithmetic number, because the mean of its divisors is an integer number (125664944724).

Almost surely, 2^{1666250040305} is an apocalyptic number.

It is an amenable number.

1666250040305 is a deficient number, since it is larger than the sum of its proper divisors (344389075279).

1666250040305 is a wasteful number, since it uses less digits than its factorization.

1666250040305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575456.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 1666250040305 its reverse (5030400526661), we get a palindrome (6696650566966).

The spelling of 1666250040305 in words is "one trillion, six hundred sixty-six billion, two hundred fifty million, forty thousand, three hundred five".