1666457425327 has 4 divisors (see below), whose sum is σ = 1682031793896. Its totient is φ = 1650883056760.

The previous prime is 1666457425271. The next prime is 1666457425333. The reversal of 1666457425327 is 7235247546661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666457425327 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666457428327) 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 3 ways as a sum of consecutive naturals, for example, 7787184124 + ... + 7787184337.

It is an arithmetic number, because the mean of its divisors is an integer number (420507948474).

Almost surely, 2^{1666457425327} is an apocalyptic number.

1666457425327 is a deficient number, since it is larger than the sum of its proper divisors (15574368569).

1666457425327 is a wasteful number, since it uses less digits than its factorization.

1666457425327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15574368568.

The product of its digits is 50803200, while the sum is 58.

The spelling of 1666457425327 in words is "one trillion, six hundred sixty-six billion, four hundred fifty-seven million, four hundred twenty-five thousand, three hundred twenty-seven".