161858995229 has 2 divisors, whose sum is σ = 161858995230. Its totient is φ = 161858995228.

The previous prime is 161858995187. The next prime is 161858995279. The reversal of 161858995229 is 922599858161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140891376025 + 20967619204 = 375355^2 + 144802^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161858995229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161858995279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80929497614 + 80929497615.

It is an arithmetic number, because the mean of its divisors is an integer number (80929497615).

Almost surely, 2^161858995229 is an apocalyptic number.

It is an amenable number.

161858995229 is a deficient number, since it is larger than the sum of its proper divisors (1).

161858995229 is an equidigital number, since it uses as much as digits as its factorization.

161858995229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27993600, while the sum is 65.

The spelling of 161858995229 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, nine hundred ninety-five thousand, two hundred twenty-nine".