161305703571 has 12 divisors (see below), whose sum is σ = 217831217352. Its totient is φ = 106175893824.

The previous prime is 161305703569. The next prime is 161305703591. The reversal of 161305703571 is 175307503161.

It is not a de Polignac number, because 161305703571 - 2¹ = 161305703569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161305703591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4288966 + ... + 4326411.

It is an arithmetic number, because the mean of its divisors is an integer number (18152601446).

Almost surely, 2^161305703571 is an apocalyptic number.

161305703571 is a deficient number, since it is larger than the sum of its proper divisors (56525513781).

161305703571 is an frugal number, since it uses more digits than its factorization.

161305703571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8615538 (or 8615459 counting only the distinct ones).

The product of its (nonzero) digits is 66150, while the sum is 39.

The spelling of 161305703571 in words is "one hundred sixty-one billion, three hundred five million, seven hundred three thousand, five hundred seventy-one".