1660661000556 has 12 divisors (see below), whose sum is σ = 3874875667992. Its totient is φ = 553553666848.

The previous prime is 1660661000533. The next prime is 1660661000611. The reversal of 1660661000556 is 6550001660661.

It is a tau number, because it is divible by the number of its divisors (12).

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, 69194208345 + ... + 69194208368.

It is an arithmetic number, because the mean of its divisors is an integer number (322906305666).

Almost surely, 2^{1660661000556} is an apocalyptic number.

It is an amenable number.

1660661000556 is an abundant number, since it is smaller than the sum of its proper divisors (2214214667436).

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

1660661000556 is a wasteful number, since it uses less digits than its factorization.

1660661000556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138388416720 (or 138388416718 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 1660661000556 in words is "one trillion, six hundred sixty billion, six hundred sixty-one million, five hundred fifty-six", and thus it is an aban number.