1666594864 has 40 divisors (see below), whose sum is σ = 3729792528. Its totient is φ = 712980480.

The previous prime is 1666594859. The next prime is 1666594879. The reversal of 1666594864 is 4684956661.

It is a super-2 number, since 2×1666594864² = 5555076881422356992, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275517 + ... + 281500.

Almost surely, 2^1666594864 is an apocalyptic number.

It is an amenable number.

1666594864 is an abundant number, since it is smaller than the sum of its proper divisors (2063197664).

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

1666594864 is a wasteful number, since it uses less digits than its factorization.

1666594864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557053 (or 557047 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 55.

The square root of 1666594864 is about 40823.9496374371. The cubic root of 1666594864 is about 1185.6140749572.

The spelling of 1666594864 in words is "one billion, six hundred sixty-six million, five hundred ninety-four thousand, eight hundred sixty-four".