161601015616069 has 2 divisors, whose sum is σ = 161601015616070. Its totient is φ = 161601015616068.

The previous prime is 161601015616039. The next prime is 161601015616111. The reversal of 161601015616069 is 960616510106161.

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., 145723285128100 + 15877730487969 = 12071590^2 + 3984687^2 .

It is a cyclic number.

It is not a de Polignac number, because 161601015616069 - 2³¹ = 161598868132421 is a prime.

It is a super-2 number, since 2×161601015616069² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161601015616039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80800507808034 + 80800507808035.

It is an arithmetic number, because the mean of its divisors is an integer number (80800507808035).

Almost surely, 2^{161601015616069} is an apocalyptic number.

It is an amenable number.

161601015616069 is a deficient number, since it is larger than the sum of its proper divisors (1).

161601015616069 is an equidigital number, since it uses as much as digits as its factorization.

161601015616069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 49.

The spelling of 161601015616069 in words is "one hundred sixty-one trillion, six hundred one billion, fifteen million, six hundred sixteen thousand, sixty-nine".