204002321551 has 4 divisors (see below), whose sum is σ = 233145510352. Its totient is φ = 174859132752.

The previous prime is 204002321543. The next prime is 204002321573. The reversal of 204002321551 is 155123200402.

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 204002321551 - 2³ = 204002321543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204002321521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14571594390 + ... + 14571594403.

It is an arithmetic number, because the mean of its divisors is an integer number (58286377588).

Almost surely, 2^204002321551 is an apocalyptic number.

204002321551 is a deficient number, since it is larger than the sum of its proper divisors (29143188801).

204002321551 is an equidigital number, since it uses as much as digits as its factorization.

204002321551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29143188800.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 204002321551 its reverse (155123200402), we get a palindrome (359125521953).

The spelling of 204002321551 in words is "two hundred four billion, two million, three hundred twenty-one thousand, five hundred fifty-one".