1666687036688 has 40 divisors (see below), whose sum is σ = 3399645712320. Its totient is φ = 789371533440.

The previous prime is 1666687036643. The next prime is 1666687036699. The reversal of 1666687036688 is 8866307866661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1781978 + ... + 2551238.

It is an arithmetic number, because the mean of its divisors is an integer number (84991142808).

Almost surely, 2^{1666687036688} is an apocalyptic number.

It is an amenable number.

1666687036688 is an abundant number, since it is smaller than the sum of its proper divisors (1732958675632).

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

1666687036688 is a wasteful number, since it uses less digits than its factorization.

1666687036688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776415 (or 776409 counting only the distinct ones).

The product of its (nonzero) digits is 501645312, while the sum is 71.

The spelling of 1666687036688 in words is "one trillion, six hundred sixty-six billion, six hundred eighty-seven million, thirty-six thousand, six hundred eighty-eight".