205242504579490 has 64 divisors (see below), whose sum is σ = 444612175096320. Its totient is φ = 66691826150400.

The previous prime is 205242504579473. The next prime is 205242504579533. The reversal of 205242504579490 is 94975405242502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 584594311 + ... + 584945290.

It is an arithmetic number, because the mean of its divisors is an integer number (6947065235880).

Almost surely, 2^{205242504579490} is an apocalyptic number.

205242504579490 is an abundant number, since it is smaller than the sum of its proper divisors (239369670516830).

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

205242504579490 is a wasteful number, since it uses less digits than its factorization.

205242504579490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169539747.

The product of its (nonzero) digits is 36288000, while the sum is 58.

The spelling of 205242504579490 in words is "two hundred five trillion, two hundred forty-two billion, five hundred four million, five hundred seventy-nine thousand, four hundred ninety".