161580539671 has 2 divisors, whose sum is σ = 161580539672. Its totient is φ = 161580539670.

The previous prime is 161580539669. The next prime is 161580539677. The reversal of 161580539671 is 176935085161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161580539671 - 2¹ = 161580539669 is a prime.

It is a super-2 number, since 2×161580539671² (a number of 23 digits) contains 22 as substring.

Together with 161580539669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161580539677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80790269835 + 80790269836.

It is an arithmetic number, because the mean of its divisors is an integer number (80790269836).

Almost surely, 2^161580539671 is an apocalyptic number.

161580539671 is a deficient number, since it is larger than the sum of its proper divisors (1).

161580539671 is an equidigital number, since it uses as much as digits as its factorization.

161580539671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 161580539671 in words is "one hundred sixty-one billion, five hundred eighty million, five hundred thirty-nine thousand, six hundred seventy-one".