79955606161 has 2 divisors, whose sum is σ = 79955606162. Its totient is φ = 79955606160.

The previous prime is 79955606111. The next prime is 79955606191. The reversal of 79955606161 is 16160655997.

79955606161 = 199944² + 199945².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39978003025 + 39977603136 = 199945^2 + 199944^2 .

It is a cyclic number.

It is not a de Polignac number, because 79955606161 - 2¹⁹ = 79955081873 is a prime.

It is a super-3 number, since 3×79955606161³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (79955606111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39977803080 + 39977803081.

It is an arithmetic number, because the mean of its divisors is an integer number (39977803081).

Almost surely, 2^79955606161 is an apocalyptic number.

79955606161 is the 199945-th centered square number.

It is an amenable number.

79955606161 is a deficient number, since it is larger than the sum of its proper divisors (1).

79955606161 is an equidigital number, since it uses as much as digits as its factorization.

79955606161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The spelling of 79955606161 in words is "seventy-nine billion, nine hundred fifty-five million, six hundred six thousand, one hundred sixty-one".