161205677 has 2 divisors, whose sum is σ = 161205678. Its totient is φ = 161205676.

The previous prime is 161205661. The next prime is 161205697. The reversal of 161205677 is 776502161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136095556 + 25110121 = 11666^2 + 5011^2 .

It is a cyclic number.

It is not a de Polignac number, because 161205677 - 2⁴ = 161205661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161205647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80602838 + 80602839.

It is an arithmetic number, because the mean of its divisors is an integer number (80602839).

Almost surely, 2^161205677 is an apocalyptic number.

It is an amenable number.

161205677 is a deficient number, since it is larger than the sum of its proper divisors (1).

161205677 is an equidigital number, since it uses as much as digits as its factorization.

161205677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 161205677 is about 12696.6797628356. The cubic root of 161205677 is about 544.2437419219.

The spelling of 161205677 in words is "one hundred sixty-one million, two hundred five thousand, six hundred seventy-seven".