204626217890 has 16 divisors (see below), whose sum is σ = 368493670008. Its totient is φ = 81813492096.

The previous prime is 204626217869. The next prime is 204626217893. The reversal of 204626217890 is 98712626402.

204626217890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 178230041929 + 26396175961 = 422173^2 + 162469^2 .

It is not an unprimeable number, because it can be changed into a prime (204626217893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4601147 + ... + 4645406.

Almost surely, 2^204626217890 is an apocalyptic number.

204626217890 is a deficient number, since it is larger than the sum of its proper divisors (163867452118).

204626217890 is a wasteful number, since it uses less digits than its factorization.

204626217890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248773.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 204626217890 in words is "two hundred four billion, six hundred twenty-six million, two hundred seventeen thousand, eight hundred ninety".