1666374459 has 16 divisors (see below), whose sum is σ = 2364364800. Its totient is φ = 1040307840.

The previous prime is 1666374443. The next prime is 1666374469. The reversal of 1666374459 is 9544736661.

It is not a de Polignac number, because 1666374459 - 2⁴ = 1666374443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1666374469) 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, 71947 + ... + 92244.

It is an arithmetic number, because the mean of its divisors is an integer number (147772800).

Almost surely, 2^1666374459 is an apocalyptic number.

1666374459 is a deficient number, since it is larger than the sum of its proper divisors (697990341).

1666374459 is a wasteful number, since it uses less digits than its factorization.

1666374459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164410.

The product of its digits is 3265920, while the sum is 51.

The square root of 1666374459 is about 40821.2500910984. The cubic root of 1666374459 is about 1185.5618073473.

The spelling of 1666374459 in words is "one billion, six hundred sixty-six million, three hundred seventy-four thousand, four hundred fifty-nine".