1608261513961 has 2 divisors, whose sum is σ = 1608261513962. Its totient is φ = 1608261513960.

The previous prime is 1608261513829. The next prime is 1608261513977. The reversal of 1608261513961 is 1693151628061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1483874804736 + 124386709225 = 1218144^2 + 352685^2 .

It is an emirp because it is prime and its reverse (1693151628061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1608261513961 - 2⁹ = 1608261513449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1608261513461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804130756980 + 804130756981.

It is an arithmetic number, because the mean of its divisors is an integer number (804130756981).

Almost surely, 2^{1608261513961} is an apocalyptic number.

It is an amenable number.

1608261513961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608261513961 is an equidigital number, since it uses as much as digits as its factorization.

1608261513961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 1608261513961 in words is "one trillion, six hundred eight billion, two hundred sixty-one million, five hundred thirteen thousand, nine hundred sixty-one".