1666642466456 has 32 divisors (see below), whose sum is σ = 3435064649280. Its totient is φ = 751781815200.

The previous prime is 1666642466339. The next prime is 1666642466473. The reversal of 1666642466456 is 6546642466661.

It is a super-2 number, since 2×1666642466456² (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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72275186 + ... + 72298241.

It is an arithmetic number, because the mean of its divisors is an integer number (107345770290).

Almost surely, 2^{1666642466456} is an apocalyptic number.

It is an amenable number.

1666642466456 is an abundant number, since it is smaller than the sum of its proper divisors (1768422182824).

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

1666642466456 is a wasteful number, since it uses less digits than its factorization.

1666642466456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144573575 (or 144573571 counting only the distinct ones).

The product of its digits is 179159040, while the sum is 62.

The spelling of 1666642466456 in words is "one trillion, six hundred sixty-six billion, six hundred forty-two million, four hundred sixty-six thousand, four hundred fifty-six".