206691689440 has 48 divisors (see below), whose sum is σ = 498698690112. Its totient is φ = 80917594624.

The previous prime is 206691689389. The next prime is 206691689459. The reversal of 206691689440 is 44986196602.

206691689440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×206691689440² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13735279 + ... + 13750318.

It is an arithmetic number, because the mean of its divisors is an integer number (10389556044).

Almost surely, 2^206691689440 is an apocalyptic number.

206691689440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206691689440 is an abundant number, since it is smaller than the sum of its proper divisors (292007000672).

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

206691689440 is a wasteful number, since it uses less digits than its factorization.

206691689440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27485659 (or 27485651 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 206691689440 in words is "two hundred six billion, six hundred ninety-one million, six hundred eighty-nine thousand, four hundred forty".