1666502671056 has 80 divisors (see below), whose sum is σ = 4568452600320. Its totient is φ = 522342747520.

The previous prime is 1666502671027. The next prime is 1666502671061. The reversal of 1666502671056 is 6501762056661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12727350 + ... + 12857621.

It is an arithmetic number, because the mean of its divisors is an integer number (57105657504).

Almost surely, 2^{1666502671056} is an apocalyptic number.

1666502671056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666502671056 is an abundant number, since it is smaller than the sum of its proper divisors (2901949929264).

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

1666502671056 is a wasteful number, since it uses less digits than its factorization.

1666502671056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25585064 (or 25585058 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 1666502671056 in words is "one trillion, six hundred sixty-six billion, five hundred two million, six hundred seventy-one thousand, fifty-six".