204880236509 has 16 divisors (see below), whose sum is σ = 225890989632. Its totient is φ = 184624247808.

The previous prime is 204880236439. The next prime is 204880236541. The reversal of 204880236509 is 905632088402.

It is not a de Polignac number, because 204880236509 - 2¹⁶ = 204880170973 is a prime.

It is a super-2 number, since 2×204880236509² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204880236599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969917 + ... + 1162109.

It is an arithmetic number, because the mean of its divisors is an integer number (14118186852).

Almost surely, 2^204880236509 is an apocalyptic number.

It is an amenable number.

204880236509 is a deficient number, since it is larger than the sum of its proper divisors (21010753123).

204880236509 is a wasteful number, since it uses less digits than its factorization.

204880236509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194156.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 204880236509 in words is "two hundred four billion, eight hundred eighty million, two hundred thirty-six thousand, five hundred nine".