164121917161 has 2 divisors, whose sum is σ = 164121917162. Its totient is φ = 164121917160.

The previous prime is 164121917117. The next prime is 164121917207. The reversal of 164121917161 is 161719121461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155555304025 + 8566613136 = 394405^2 + 92556^2 .

It is a cyclic number.

It is not a de Polignac number, because 164121917161 - 2²¹ = 164119820009 is a prime.

It is not a weakly prime, because it can be changed into another prime (164121917261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82060958580 + 82060958581.

It is an arithmetic number, because the mean of its divisors is an integer number (82060958581).

Almost surely, 2^164121917161 is an apocalyptic number.

It is an amenable number.

164121917161 is a deficient number, since it is larger than the sum of its proper divisors (1).

164121917161 is an equidigital number, since it uses as much as digits as its factorization.

164121917161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The spelling of 164121917161 in words is "one hundred sixty-four billion, one hundred twenty-one million, nine hundred seventeen thousand, one hundred sixty-one".