1666642466236 has 24 divisors (see below), whose sum is σ = 3181805058096. Its totient is φ = 757556881920.

The previous prime is 1666642466221. The next prime is 1666642466243. The reversal of 1666642466236 is 6326642466661.

It is a happy number.

It is a super-2 number, since 2×1666642466236² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7239820 + ... + 7466476.

It is an arithmetic number, because the mean of its divisors is an integer number (132575210754).

Almost surely, 2^{1666642466236} is an apocalyptic number.

It is an amenable number.

1666642466236 is a deficient number, since it is larger than the sum of its proper divisors (1515162591860).

1666642466236 is a wasteful number, since it uses less digits than its factorization.

1666642466236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393789 (or 393787 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 58.

The spelling of 1666642466236 in words is "one trillion, six hundred sixty-six billion, six hundred forty-two million, four hundred sixty-six thousand, two hundred thirty-six".