204420253555 has 48 divisors (see below), whose sum is σ = 288794868480. Its totient is φ = 136067045184.

The previous prime is 204420253519. The next prime is 204420253561. The reversal of 204420253555 is 555352024402.

It is not a de Polignac number, because 204420253555 - 2¹⁵ = 204420220787 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10538856 + ... + 10558234.

It is an arithmetic number, because the mean of its divisors is an integer number (6016559760).

Almost surely, 2^204420253555 is an apocalyptic number.

204420253555 is a deficient number, since it is larger than the sum of its proper divisors (84374614925).

204420253555 is a wasteful number, since it uses less digits than its factorization.

204420253555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19640 (or 19597 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 37.

Adding to 204420253555 its reverse (555352024402), we get a palindrome (759772277957).

The spelling of 204420253555 in words is "two hundred four billion, four hundred twenty million, two hundred fifty-three thousand, five hundred fifty-five".