206990829599 has 4 divisors (see below), whose sum is σ = 207147761040. Its totient is φ = 206833898160.

The previous prime is 206990829569. The next prime is 206990829631. The reversal of 206990829599 is 995928099602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206990829599 - 2²⁰ = 206989781023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206990829569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78463742 + ... + 78466379.

It is an arithmetic number, because the mean of its divisors is an integer number (51786940260).

Almost surely, 2^206990829599 is an apocalyptic number.

206990829599 is a deficient number, since it is larger than the sum of its proper divisors (156931441).

206990829599 is a wasteful number, since it uses less digits than its factorization.

206990829599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156931440.

The product of its (nonzero) digits is 56687040, while the sum is 68.

The spelling of 206990829599 in words is "two hundred six billion, nine hundred ninety million, eight hundred twenty-nine thousand, five hundred ninety-nine".