159198604561 has 2 divisors, whose sum is σ = 159198604562. Its totient is φ = 159198604560.

The previous prime is 159198604559. The next prime is 159198604601. The reversal of 159198604561 is 165406891951.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156353022225 + 2845582336 = 395415^2 + 53344^2 .

It is a cyclic number.

It is not a de Polignac number, because 159198604561 - 2¹ = 159198604559 is a prime.

Together with 159198604559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (159198604501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79599302280 + 79599302281.

It is an arithmetic number, because the mean of its divisors is an integer number (79599302281).

Almost surely, 2^159198604561 is an apocalyptic number.

It is an amenable number.

159198604561 is a deficient number, since it is larger than the sum of its proper divisors (1).

159198604561 is an equidigital number, since it uses as much as digits as its factorization.

159198604561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 159198604561 in words is "one hundred fifty-nine billion, one hundred ninety-eight million, six hundred four thousand, five hundred sixty-one".