206988681391 has 8 divisors (see below), whose sum is σ = 207488952000. Its totient is φ = 206488504320.

The previous prime is 206988681323. The next prime is 206988681421. The reversal of 206988681391 is 193186889602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206988681391 - 2²⁷ = 206854463663 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 (206988682391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6729375 + ... + 6760063.

It is an arithmetic number, because the mean of its divisors is an integer number (25936119000).

Almost surely, 2^206988681391 is an apocalyptic number.

206988681391 is a deficient number, since it is larger than the sum of its proper divisors (500270609).

206988681391 is a wasteful number, since it uses less digits than its factorization.

206988681391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46769.

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 206988681391 in words is "two hundred six billion, nine hundred eighty-eight million, six hundred eighty-one thousand, three hundred ninety-one".