206681970656 has 96 divisors (see below), whose sum is σ = 474136141248. Its totient is φ = 86858403840.

The previous prime is 206681970631. The next prime is 206681970673. The reversal of 206681970656 is 656079186602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 2792366 + ... + 2865426.

It is an arithmetic number, because the mean of its divisors is an integer number (4938918138).

Almost surely, 2^206681970656 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 206681970656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237068070624).

206681970656 is an abundant number, since it is smaller than the sum of its proper divisors (267454170592).

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

206681970656 is a wasteful number, since it uses less digits than its factorization.

206681970656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73324 (or 73316 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 206681970656 in words is "two hundred six billion, six hundred eighty-one million, nine hundred seventy thousand, six hundred fifty-six".