206691056640 has 1056 divisors, whose sum is σ = 803429093376. Its totient is φ = 50801541120.

The previous prime is 206691056563. The next prime is 206691056651. The reversal of 206691056640 is 46650196602.

206691056640 is a `hidden beast` number, since 20 + 6 + 69 + 1 + 0 + 566 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 887085964 + ... + 887086196.

Almost surely, 2^206691056640 is an apocalyptic number.

206691056640 is a gapful number since it is divisible by the number (20) 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 206691056640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401714546688).

206691056640 is an abundant number, since it is smaller than the sum of its proper divisors (596738036736).

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

206691056640 is a wasteful number, since it uses less digits than its factorization.

206691056640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 206691056640 in words is "two hundred six billion, six hundred ninety-one million, fifty-six thousand, six hundred forty".