204563880471890 has 16 divisors (see below), whose sum is σ = 368221347477720. Its totient is φ = 81824138271360.

The previous prime is 204563880471877. The next prime is 204563880471913. The reversal of 204563880471890 is 98174088365402.

It is a Cunningham number, because it is equal to 14302583²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 73642983239401 + 130920897232489 = 8581549^2 + 11442067^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176131925 + ... + 177289544.

It is a 1-persistent number, because it is pandigital, but 2⋅204563880471890 = 409127760943780 is not.

Almost surely, 2^{204563880471890} is an apocalyptic number.

204563880471890 is a deficient number, since it is larger than the sum of its proper divisors (163657467005830).

204563880471890 is a wasteful number, since it uses less digits than its factorization.

204563880471890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353479357.

The product of its (nonzero) digits is 92897280, while the sum is 65.

The spelling of 204563880471890 in words is "two hundred four trillion, five hundred sixty-three billion, eight hundred eighty million, four hundred seventy-one thousand, eight hundred ninety".