204011651551 has 4 divisors (see below), whose sum is σ = 206594077600. Its totient is φ = 201429225504.

The previous prime is 204011651549. The next prime is 204011651567. The reversal of 204011651551 is 155156110402.

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 204011651551 - 2¹ = 204011651549 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 (204011651521) 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, 1291212906 + ... + 1291213063.

It is an arithmetic number, because the mean of its divisors is an integer number (51648519400).

Almost surely, 2^204011651551 is an apocalyptic number.

204011651551 is a deficient number, since it is larger than the sum of its proper divisors (2582426049).

204011651551 is an equidigital number, since it uses as much as digits as its factorization.

204011651551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582426048.

The product of its (nonzero) digits is 6000, while the sum is 31.

Adding to 204011651551 its reverse (155156110402), we get a palindrome (359167761953).

The spelling of 204011651551 in words is "two hundred four billion, eleven million, six hundred fifty-one thousand, five hundred fifty-one".