206138935044 has 240 divisors, whose sum is σ = 634574134656. Its totient is φ = 57134937600.

The previous prime is 206138935043. The next prime is 206138935061. The reversal of 206138935044 is 440539831602.

206138935044 is a `hidden beast` number, since 2 + 0 + 6 + 138 + 9 + 3 + 504 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (206138935043) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10089199 + ... + 10109609.

Almost surely, 2^206138935044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206138935044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317287067328).

206138935044 is an abundant number, since it is smaller than the sum of its proper divisors (428435199612).

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

206138935044 is a wasteful number, since it uses less digits than its factorization.

206138935044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20568 (or 20557 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 206138935044 in words is "two hundred six billion, one hundred thirty-eight million, nine hundred thirty-five thousand, forty-four".