161606106651137 has 2 divisors, whose sum is σ = 161606106651138. Its totient is φ = 161606106651136.

The previous prime is 161606106651029. The next prime is 161606106651163. The reversal of 161606106651137 is 731156601606161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160482303121921 + 1123803529216 = 12668161^2 + 1060096^2 .

It is a cyclic number.

It is not a de Polignac number, because 161606106651137 - 2²⁶ = 161606039542273 is a prime.

It is a super-2 number, since 2×161606106651137² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161606106651167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803053325568 + 80803053325569.

It is an arithmetic number, because the mean of its divisors is an integer number (80803053325569).

Almost surely, 2^{161606106651137} is an apocalyptic number.

It is an amenable number.

161606106651137 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606106651137 is an equidigital number, since it uses as much as digits as its factorization.

161606106651137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 161606106651137 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred six million, six hundred fifty-one thousand, one hundred thirty-seven".