6659212816 has 45 divisors (see below), whose sum is σ = 13502803951. Its totient is φ = 3181250336.

The previous prime is 6659212801. The next prime is 6659212823. The reversal of 6659212816 is 6182129566.

The square root of 6659212816 is 81604.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7507125 + ... + 7508011.

Almost surely, 2^6659212816 is an apocalyptic number.

6659212816 is the 81604-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6659212816

6659212816 is an abundant number, since it is smaller than the sum of its proper divisors (6843591135).

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

6659212816 is an frugal number, since it uses more digits than its factorization.

6659212816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828 (or 912 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The cubic root of 6659212816 is about 1881.3703619771.

The spelling of 6659212816 in words is "six billion, six hundred fifty-nine million, two hundred twelve thousand, eight hundred sixteen".