204423442451 has 4 divisors (see below), whose sum is σ = 205725502752. Its totient is φ = 203121382152.

The previous prime is 204423442397. The next prime is 204423442471. The reversal of 204423442451 is 154244324402.

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

It is a cyclic number.

It is not a de Polignac number, because 204423442451 - 2⁶ = 204423442387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204423442471) 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 3 ways as a sum of consecutive naturals, for example, 651029915 + ... + 651030228.

It is an arithmetic number, because the mean of its divisors is an integer number (51431375688).

Almost surely, 2^204423442451 is an apocalyptic number.

204423442451 is a deficient number, since it is larger than the sum of its proper divisors (1302060301).

204423442451 is a wasteful number, since it uses less digits than its factorization.

204423442451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302060300.

The product of its (nonzero) digits is 122880, while the sum is 35.

Adding to 204423442451 its reverse (154244324402), we get a palindrome (358667766853).

The spelling of 204423442451 in words is "two hundred four billion, four hundred twenty-three million, four hundred forty-two thousand, four hundred fifty-one".