204520654426642 has 4 divisors (see below), whose sum is σ = 306780981639966. Its totient is φ = 102260327213320.

The previous prime is 204520654426603. The next prime is 204520654426651. The reversal of 204520654426642 is 246624456025402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 199081912710321 + 5438741716321 = 14109639^2 + 2332111^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 204520654426642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51130163606659 + ... + 51130163606662.

Almost surely, 2^{204520654426642} is an apocalyptic number.

204520654426642 is a deficient number, since it is larger than the sum of its proper divisors (102260327213324).

204520654426642 is a wasteful number, since it uses less digits than its factorization.

204520654426642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102260327213323.

The product of its (nonzero) digits is 22118400, while the sum is 52.

The spelling of 204520654426642 in words is "two hundred four trillion, five hundred twenty billion, six hundred fifty-four million, four hundred twenty-six thousand, six hundred forty-two".