206843390664 has 16 divisors (see below), whose sum is σ = 517108476720. Its totient is φ = 68947796880.

The previous prime is 206843390659. The next prime is 206843390681. The reversal of 206843390664 is 466093348602.

It is a super-2 number, since 2×206843390664² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4309237282 + ... + 4309237329.

It is an arithmetic number, because the mean of its divisors is an integer number (32319279795).

Almost surely, 2^206843390664 is an apocalyptic number.

206843390664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

206843390664 is an abundant number, since it is smaller than the sum of its proper divisors (310265086056).

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

206843390664 is a wasteful number, since it uses less digits than its factorization.

206843390664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8618474620 (or 8618474616 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 51.

The spelling of 206843390664 in words is "two hundred six billion, eight hundred forty-three million, three hundred ninety thousand, six hundred sixty-four".