204518159957 has 2 divisors, whose sum is σ = 204518159958. Its totient is φ = 204518159956.

The previous prime is 204518159941. The next prime is 204518160001. The reversal of 204518159957 is 759951815402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187169582161 + 17348577796 = 432631^2 + 131714^2 .

It is a cyclic number.

It is not a de Polignac number, because 204518159957 - 2⁴ = 204518159941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204518159927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102259079978 + 102259079979.

It is an arithmetic number, because the mean of its divisors is an integer number (102259079979).

Almost surely, 2^204518159957 is an apocalyptic number.

It is an amenable number.

204518159957 is a deficient number, since it is larger than the sum of its proper divisors (1).

204518159957 is an equidigital number, since it uses as much as digits as its factorization.

204518159957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 56.

The spelling of 204518159957 in words is "two hundred four billion, five hundred eighteen million, one hundred fifty-nine thousand, nine hundred fifty-seven".