204261691237938 has 96 divisors (see below), whose sum is σ = 465905250104112. Its totient is φ = 64590870528000.

The previous prime is 204261691237921. The next prime is 204261691237949. The reversal of 204261691237938 is 839732196162402.

204261691237938 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 616 + 9 + 1 + 2 + 3 + 7 + 9 + 3 + 8 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 123436610701209 + 80825080536729 = 11110203^2 + 8990277^2 .

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41380720 + ... + 46053092.

Almost surely, 2^{204261691237938} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204261691237938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232952625052056).

204261691237938 is an abundant number, since it is smaller than the sum of its proper divisors (261643558866174).

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

204261691237938 is a wasteful number, since it uses less digits than its factorization.

204261691237938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674060 (or 4674057 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 204261691237938 in words is "two hundred four trillion, two hundred sixty-one billion, six hundred ninety-one million, two hundred thirty-seven thousand, nine hundred thirty-eight".