206400644440 has 32 divisors (see below), whose sum is σ = 464430217680. Its totient is φ = 82555143552.

The previous prime is 206400644423. The next prime is 206400644543. The reversal of 206400644440 is 44446004602.

206400644440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 206400644396 and 206400644405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530827 + ... + 833413.

Almost surely, 2^206400644440 is an apocalyptic number.

206400644440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206400644440 is an abundant number, since it is smaller than the sum of its proper divisors (258029573240).

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

206400644440 is a wasteful number, since it uses less digits than its factorization.

206400644440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319651 (or 319647 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

The spelling of 206400644440 in words is "two hundred six billion, four hundred million, six hundred forty-four thousand, four hundred forty".