1666458666 has 12 divisors (see below), whose sum is σ = 3610660482. Its totient is φ = 555486216.

The previous prime is 1666458659. The next prime is 1666458667. The reversal of 1666458666 is 6668546661.

It can be written as a sum of positive squares in only one way, i.e., 1665864225 + 594441 = 40815^2 + 771^2 .

It is a super-3 number, since 3×1666458666³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666458667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46290501 + ... + 46290536.

Almost surely, 2^1666458666 is an apocalyptic number.

1666458666 is an abundant number, since it is smaller than the sum of its proper divisors (1944201816).

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

1666458666 is a wasteful number, since it uses less digits than its factorization.

1666458666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92581045 (or 92581042 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 1666458666 is about 40822.2814894023. The cubic root of 1666458666 is about 1185.5817770328.

The spelling of 1666458666 in words is "one billion, six hundred sixty-six million, four hundred fifty-eight thousand, six hundred sixty-six".