206443616440 has 32 divisors (see below), whose sum is σ = 467279578080. Its totient is φ = 82082968192.

The previous prime is 206443616429. The next prime is 206443616459. The reversal of 206443616440 is 44616344602.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 206443616393 and 206443616402.

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, 15445687 + ... + 15459046.

It is an arithmetic number, because the mean of its divisors is an integer number (14602486815).

Almost surely, 2^206443616440 is an apocalyptic number.

206443616440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206443616440 is an abundant number, since it is smaller than the sum of its proper divisors (260835961640).

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

206443616440 is a wasteful number, since it uses less digits than its factorization.

206443616440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30904911 (or 30904907 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 206443616440 in words is "two hundred six billion, four hundred forty-three million, six hundred sixteen thousand, four hundred forty".