204135400681 has 8 divisors (see below), whose sum is σ = 208083250944. Its totient is φ = 200225329200.

The previous prime is 204135400673. The next prime is 204135400691. The reversal of 204135400681 is 186004531402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204135400681 - 2³ = 204135400673 is a prime.

It is a super-2 number, since 2×204135400681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204135400691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9433785 + ... + 9455398.

It is an arithmetic number, because the mean of its divisors is an integer number (26010406368).

Almost surely, 2^204135400681 is an apocalyptic number.

It is an amenable number.

204135400681 is a deficient number, since it is larger than the sum of its proper divisors (3947850263).

204135400681 is a wasteful number, since it uses less digits than its factorization.

204135400681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18889391.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 204135400681 in words is "two hundred four billion, one hundred thirty-five million, four hundred thousand, six hundred eighty-one".