204135537606 has 64 divisors (see below), whose sum is σ = 548168173056. Its totient is φ = 48943584000.

The previous prime is 204135537589. The next prime is 204135537631. The reversal of 204135537606 is 606735531402.

It is a super-2 number, since 2×204135537606² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16988295 + ... + 17000306.

It is an arithmetic number, because the mean of its divisors is an integer number (8565127704).

Almost surely, 2^204135537606 is an apocalyptic number.

204135537606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

204135537606 is an abundant number, since it is smaller than the sum of its proper divisors (344032635450).

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

204135537606 is a wasteful number, since it uses less digits than its factorization.

204135537606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33988637.

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 204135537606 in words is "two hundred four billion, one hundred thirty-five million, five hundred thirty-seven thousand, six hundred six".