161717457547 has 2 divisors, whose sum is σ = 161717457548. Its totient is φ = 161717457546.

The previous prime is 161717457533. The next prime is 161717457581. The reversal of 161717457547 is 745754717161.

It is a weak prime.

It is an emirp because it is prime and its reverse (745754717161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161717457547 - 2³⁵ = 127357719179 is a prime.

It is not a weakly prime, because it can be changed into another prime (161717457947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80858728773 + 80858728774.

It is an arithmetic number, because the mean of its divisors is an integer number (80858728774).

Almost surely, 2^161717457547 is an apocalyptic number.

161717457547 is a deficient number, since it is larger than the sum of its proper divisors (1).

161717457547 is an equidigital number, since it uses as much as digits as its factorization.

161717457547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5762400, while the sum is 55.

The spelling of 161717457547 in words is "one hundred sixty-one billion, seven hundred seventeen million, four hundred fifty-seven thousand, five hundred forty-seven".