161000643527 has 2 divisors, whose sum is σ = 161000643528. Its totient is φ = 161000643526.

The previous prime is 161000643509. The next prime is 161000643533. The reversal of 161000643527 is 725346000161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161000643527 is a prime.

It is a super-2 number, since 2×161000643527² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161000643127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80500321763 + 80500321764.

It is an arithmetic number, because the mean of its divisors is an integer number (80500321764).

Almost surely, 2^161000643527 is an apocalyptic number.

161000643527 is a deficient number, since it is larger than the sum of its proper divisors (1).

161000643527 is an equidigital number, since it uses as much as digits as its factorization.

161000643527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 161000643527 its reverse (725346000161), we get a palindrome (886346643688).

The spelling of 161000643527 in words is "one hundred sixty-one billion, six hundred forty-three thousand, five hundred twenty-seven".