1666441061466 has 8 divisors (see below), whose sum is σ = 3332882122944. Its totient is φ = 555480353820.

The previous prime is 1666441061443. The next prime is 1666441061507. The reversal of 1666441061466 is 6641601446661.

It is a sphenic number, since it is the product of 3 distinct primes.

1666441061466 is an admirable number.

It is a super-2 number, since 2×1666441061466² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138870088450 + ... + 138870088461.

It is an arithmetic number, because the mean of its divisors is an integer number (416610265368).

Almost surely, 2^{1666441061466} is an apocalyptic number.

1666441061466 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1666441061466 is a wasteful number, since it uses less digits than its factorization.

1666441061466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277740176916.

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 1666441061466 in words is "one trillion, six hundred sixty-six billion, four hundred forty-one million, sixty-one thousand, four hundred sixty-six".