161156606101009 has 2 divisors, whose sum is σ = 161156606101010. Its totient is φ = 161156606101008.

The previous prime is 161156606100983. The next prime is 161156606101039. The reversal of 161156606101009 is 900101606651161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134873266115025 + 26283339985984 = 11613495^2 + 5126728^2 .

It is a cyclic number.

It is not a de Polignac number, because 161156606101009 - 2⁴⁷ = 20419117745681 is a prime.

It is a super-2 number, since 2×161156606101009² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161156606101039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80578303050504 + 80578303050505.

It is an arithmetic number, because the mean of its divisors is an integer number (80578303050505).

Almost surely, 2^{161156606101009} is an apocalyptic number.

It is an amenable number.

161156606101009 is a deficient number, since it is larger than the sum of its proper divisors (1).

161156606101009 is an equidigital number, since it uses as much as digits as its factorization.

161156606101009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 161156606101009 in words is "one hundred sixty-one trillion, one hundred fifty-six billion, six hundred six million, one hundred one thousand, nine".