161722467157 has 2 divisors, whose sum is σ = 161722467158. Its totient is φ = 161722467156.

The previous prime is 161722467139. The next prime is 161722467233. The reversal of 161722467157 is 751764227161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153464928516 + 8257538641 = 391746^2 + 90871^2 .

It is an emirp because it is prime and its reverse (751764227161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161722467157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161722467157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161722467107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80861233578 + 80861233579.

It is an arithmetic number, because the mean of its divisors is an integer number (80861233579).

Almost surely, 2^161722467157 is an apocalyptic number.

It is an amenable number.

161722467157 is a deficient number, since it is larger than the sum of its proper divisors (1).

161722467157 is an equidigital number, since it uses as much as digits as its factorization.

161722467157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The spelling of 161722467157 in words is "one hundred sixty-one billion, seven hundred twenty-two million, four hundred sixty-seven thousand, one hundred fifty-seven".