161562506471 has 2 divisors, whose sum is σ = 161562506472. Its totient is φ = 161562506470.

The previous prime is 161562506411. The next prime is 161562506503. The reversal of 161562506471 is 174605265161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161562506471 is a prime.

It is a super-3 number, since 3×161562506471³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161562506411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80781253235 + 80781253236.

It is an arithmetic number, because the mean of its divisors is an integer number (80781253236).

Almost surely, 2^161562506471 is an apocalyptic number.

161562506471 is a deficient number, since it is larger than the sum of its proper divisors (1).

161562506471 is an equidigital number, since it uses as much as digits as its factorization.

161562506471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 161562506471 in words is "one hundred sixty-one billion, five hundred sixty-two million, five hundred six thousand, four hundred seventy-one".