1665556060686 has 96 divisors (see below), whose sum is σ = 3970059754752. Its totient is φ = 464333345280.

The previous prime is 1665556060667. The next prime is 1665556060687. The reversal of 1665556060686 is 6860606555661.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665556060687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1613485 + ... + 2436071.

It is an arithmetic number, because the mean of its divisors is an integer number (41354789112).

Almost surely, 2^{1665556060686} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665556060686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985029877376).

1665556060686 is an abundant number, since it is smaller than the sum of its proper divisors (2304503694066).

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

1665556060686 is a wasteful number, since it uses less digits than its factorization.

1665556060686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822774 (or 822767 counting only the distinct ones).

The product of its (nonzero) digits is 46656000, while the sum is 60.

The spelling of 1665556060686 in words is "one trillion, six hundred sixty-five billion, five hundred fifty-six million, sixty thousand, six hundred eighty-six".