1660486870217 has 16 divisors (see below), whose sum is σ = 1909211980032. Its totient is φ = 1414641269760.

The previous prime is 1660486870177. The next prime is 1660486870247. The reversal of 1660486870217 is 7120786840661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1660486870217 - 2³⁸ = 1385608963273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1660486870247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17198117 + ... + 17294397.

It is an arithmetic number, because the mean of its divisors is an integer number (119325748752).

Almost surely, 2^{1660486870217} is an apocalyptic number.

It is an amenable number.

1660486870217 is a deficient number, since it is larger than the sum of its proper divisors (248725109815).

1660486870217 is a wasteful number, since it uses less digits than its factorization.

1660486870217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111208.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 1660486870217 in words is "one trillion, six hundred sixty billion, four hundred eighty-six million, eight hundred seventy thousand, two hundred seventeen".