1660644216 has 96 divisors (see below), whose sum is σ = 5607388800. Its totient is φ = 431334720.

The previous prime is 1660644203. The next prime is 1660644217. The reversal of 1660644216 is 6124460661.

1660644216 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 644 + 2 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660644217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144226 + ... + 155313.

It is an arithmetic number, because the mean of its divisors is an integer number (58410300).

Almost surely, 2^1660644216 is an apocalyptic number.

It is an amenable number.

1660644216 is an abundant number, since it is smaller than the sum of its proper divisors (3946744584).

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

1660644216 is a wasteful number, since it uses less digits than its factorization.

1660644216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299569 (or 299562 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1660644216 is about 40751.0026379720. The cubic root of 1660644216 is about 1184.2012969623.

The spelling of 1660644216 in words is "one billion, six hundred sixty million, six hundred forty-four thousand, two hundred sixteen".