1660645214604 has 108 divisors (see below), whose sum is σ = 4437192843720. Its totient is φ = 522225792000.

The previous prime is 1660645214563. The next prime is 1660645214609. The reversal of 1660645214604 is 4064125460661.

1660645214604 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 64 + 521 + 4 + 60 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1660645214604.

It is not an unprimeable number, because it can be changed into a prime (1660645214609) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 39706504 + ... + 39748304.

Almost surely, 2^{1660645214604} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660645214604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2218596421860).

1660645214604 is an abundant number, since it is smaller than the sum of its proper divisors (2776547629116).

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

1660645214604 is a wasteful number, since it uses less digits than its factorization.

1660645214604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42312 (or 42066 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 1660645214604 in words is "one trillion, six hundred sixty billion, six hundred forty-five million, two hundred fourteen thousand, six hundred four".