206618738340 has 48 divisors (see below), whose sum is σ = 661179964032. Its totient is φ = 47227140096.

The previous prime is 206618738329. The next prime is 206618738393. The reversal of 206618738340 is 43837816602.

It is a self number, because there is not a number n which added to its sum of digits gives 206618738340.

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, 245974269 + ... + 245975108.

It is an arithmetic number, because the mean of its divisors is an integer number (13774582584).

Almost surely, 2^206618738340 is an apocalyptic number.

206618738340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206618738340 is an abundant number, since it is smaller than the sum of its proper divisors (454561225692).

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

206618738340 is a wasteful number, since it uses less digits than its factorization.

206618738340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491949396 (or 491949394 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 206618738340 in words is "two hundred six billion, six hundred eighteen million, seven hundred thirty-eight thousand, three hundred forty".