161111206637 has 2 divisors, whose sum is σ = 161111206638. Its totient is φ = 161111206636.

The previous prime is 161111206579. The next prime is 161111206643. The reversal of 161111206637 is 736602111161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161101087876 + 10118761 = 401374^2 + 3181^2 .

It is a cyclic number.

It is not a de Polignac number, because 161111206637 - 2¹⁰ = 161111205613 is a prime.

It is a super-2 number, since 2×161111206637² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161111206597 and 161111206606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161111206687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80555603318 + 80555603319.

It is an arithmetic number, because the mean of its divisors is an integer number (80555603319).

Almost surely, 2^161111206637 is an apocalyptic number.

It is an amenable number.

161111206637 is a deficient number, since it is larger than the sum of its proper divisors (1).

161111206637 is an equidigital number, since it uses as much as digits as its factorization.

161111206637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

Adding to 161111206637 its reverse (736602111161), we get a palindrome (897713317798).

The spelling of 161111206637 in words is "one hundred sixty-one billion, one hundred eleven million, two hundred six thousand, six hundred thirty-seven".