204243515015 has 16 divisors (see below), whose sum is σ = 258010945920. Its totient is φ = 154783602720.

The previous prime is 204243515011. The next prime is 204243515023. The reversal of 204243515015 is 510515342402.

It is not a de Polignac number, because 204243515015 - 2² = 204243515011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204243515011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1340060 + ... + 1484670.

It is an arithmetic number, because the mean of its divisors is an integer number (16125684120).

Almost surely, 2^204243515015 is an apocalyptic number.

204243515015 is a deficient number, since it is larger than the sum of its proper divisors (53767430905).

204243515015 is a wasteful number, since it uses less digits than its factorization.

204243515015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159502.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 204243515015 its reverse (510515342402), we get a palindrome (714758857417).

The spelling of 204243515015 in words is "two hundred four billion, two hundred forty-three million, five hundred fifteen thousand, fifteen".