161655062641 has 2 divisors, whose sum is σ = 161655062642. Its totient is φ = 161655062640.

The previous prime is 161655062579. The next prime is 161655062651. The reversal of 161655062641 is 146260556161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161652243600 + 2819041 = 402060^2 + 1679^2 .

It is an emirp because it is prime and its reverse (146260556161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161655062641 is a prime.

It is a super-2 number, since 2×161655062641² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161655062651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80827531320 + 80827531321.

It is an arithmetic number, because the mean of its divisors is an integer number (80827531321).

Almost surely, 2^161655062641 is an apocalyptic number.

It is an amenable number.

161655062641 is a deficient number, since it is larger than the sum of its proper divisors (1).

161655062641 is an equidigital number, since it uses as much as digits as its factorization.

161655062641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 161655062641 in words is "one hundred sixty-one billion, six hundred fifty-five million, sixty-two thousand, six hundred forty-one".