206665016730 has 128 divisors (see below), whose sum is σ = 554945126400. Its totient is φ = 48985457664.

The previous prime is 206665016729. The next prime is 206665016749. The reversal of 206665016730 is 37610566602.

It is a super-2 number, since 2×206665016730² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 815161 + ... + 1038179.

It is an arithmetic number, because the mean of its divisors is an integer number (4335508800).

Almost surely, 2^206665016730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206665016730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277472563200).

206665016730 is an abundant number, since it is smaller than the sum of its proper divisors (348280109670).

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

206665016730 is a wasteful number, since it uses less digits than its factorization.

206665016730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223148.

The product of its (nonzero) digits is 272160, while the sum is 42.

The spelling of 206665016730 in words is "two hundred six billion, six hundred sixty-five million, sixteen thousand, seven hundred thirty".