1666000375 has 16 divisors (see below), whose sum is σ = 2239106688. Its totient is φ = 1230276000.

The previous prime is 1666000361. The next prime is 1666000403. The reversal of 1666000375 is 5730006661.

It is a happy number.

It is not a de Polignac number, because 1666000375 - 2¹³ = 1665992183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666000375.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510991 + ... + 514240.

It is an arithmetic number, because the mean of its divisors is an integer number (139944168).

Almost surely, 2^1666000375 is an apocalyptic number.

1666000375 is a deficient number, since it is larger than the sum of its proper divisors (573106313).

1666000375 is a wasteful number, since it uses less digits than its factorization.

1666000375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025259 (or 1025249 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 1666000375 is about 40816.6678576289. The cubic root of 1666000375 is about 1185.4730852133.

The spelling of 1666000375 in words is "one billion, six hundred sixty-six million, three hundred seventy-five", and thus it is an aban number.