1660655001985 has 32 divisors (see below), whose sum is σ = 2320639580160. Its totient is φ = 1117153609728.

The previous prime is 1660655001913. The next prime is 1660655002129. The reversal of 1660655001985 is 5891005560661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660655001985 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26623344 + ... + 26685646.

It is an arithmetic number, because the mean of its divisors is an integer number (72519986880).

Almost surely, 2^{1660655001985} is an apocalyptic number.

It is an amenable number.

1660655001985 is a deficient number, since it is larger than the sum of its proper divisors (659984578175).

1660655001985 is a wasteful number, since it uses less digits than its factorization.

1660655001985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76737.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 1660655001985 in words is "one trillion, six hundred sixty billion, six hundred fifty-five million, one thousand, nine hundred eighty-five".