1662641666466 has 16 divisors (see below), whose sum is σ = 3627581817888. Its totient is φ = 503830808000.

The previous prime is 1662641666459. The next prime is 1662641666501. The reversal of 1662641666466 is 6646661462661.

It is a happy number.

It is a super-2 number, since 2×1662641666466² (a number of 25 digits) contains 22 as substring.

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, 12595770135 + ... + 12595770266.

It is an arithmetic number, because the mean of its divisors is an integer number (226723863618).

Almost surely, 2^{1662641666466} is an apocalyptic number.

1662641666466 is an abundant number, since it is smaller than the sum of its proper divisors (1964940151422).

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

1662641666466 is a wasteful number, since it uses less digits than its factorization.

1662641666466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25191540417.

The product of its digits is 53747712, while the sum is 60.

The spelling of 1662641666466 in words is "one trillion, six hundred sixty-two billion, six hundred forty-one million, six hundred sixty-six thousand, four hundred sixty-six".