1666474368 has 256 divisors, whose sum is σ = 5135659200. Its totient is φ = 474218496.

The previous prime is 1666474333. The next prime is 1666474379. The reversal of 1666474368 is 8634746661.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1666474368.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6194938 + ... + 6195206.

Almost surely, 2^1666474368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666474368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2567829600).

1666474368 is an abundant number, since it is smaller than the sum of its proper divisors (3469184832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666474368 is a wasteful number, since it uses less digits than its factorization.

1666474368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 377 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 51.

The square root of 1666474368 is about 40822.4738103903. The cubic root of 1666474368 is about 1185.5855006869.

The spelling of 1666474368 in words is "one billion, six hundred sixty-six million, four hundred seventy-four thousand, three hundred sixty-eight".