161587982729 has 2 divisors, whose sum is σ = 161587982730. Its totient is φ = 161587982728.

The previous prime is 161587982723. The next prime is 161587982797. The reversal of 161587982729 is 927289785161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98126815504 + 63461167225 = 313252^2 + 251915^2 .

It is an emirp because it is prime and its reverse (927289785161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161587982729 - 2⁸ = 161587982473 is a prime.

It is a super-2 number, since 2×161587982729² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161587982723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80793991364 + 80793991365.

It is an arithmetic number, because the mean of its divisors is an integer number (80793991365).

Almost surely, 2^161587982729 is an apocalyptic number.

It is an amenable number.

161587982729 is a deficient number, since it is larger than the sum of its proper divisors (1).

161587982729 is an equidigital number, since it uses as much as digits as its factorization.

161587982729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 65.

The spelling of 161587982729 in words is "one hundred sixty-one billion, five hundred eighty-seven million, nine hundred eighty-two thousand, seven hundred twenty-nine".