206580395490 has 64 divisors (see below), whose sum is σ = 599951142144. Its totient is φ = 44440823808.

The previous prime is 206580395479. The next prime is 206580395491. The reversal of 206580395490 is 94593085602.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (206580395491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28929259 + ... + 28936398.

It is an arithmetic number, because the mean of its divisors is an integer number (9374236596).

Almost surely, 2^206580395490 is an apocalyptic number.

206580395490 is an abundant number, since it is smaller than the sum of its proper divisors (393370746654).

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

206580395490 is a wasteful number, since it uses less digits than its factorization.

206580395490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57865691.

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 206580395490 in words is "two hundred six billion, five hundred eighty million, three hundred ninety-five thousand, four hundred ninety".