206712551668 has 48 divisors (see below), whose sum is σ = 427323552768. Its totient is φ = 85620384000.

The previous prime is 206712551651. The next prime is 206712551701. The reversal of 206712551668 is 866155217602.

206712551668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504078 + ... + 817018.

It is an arithmetic number, because the mean of its divisors is an integer number (8902574016).

Almost surely, 2^206712551668 is an apocalyptic number.

206712551668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206712551668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213661776384).

206712551668 is an abundant number, since it is smaller than the sum of its proper divisors (220611001100).

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

206712551668 is a wasteful number, since it uses less digits than its factorization.

206712551668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313744 (or 313742 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 206712551668 in words is "two hundred six billion, seven hundred twelve million, five hundred fifty-one thousand, six hundred sixty-eight".