161287276627849 has 2 divisors, whose sum is σ = 161287276627850. Its totient is φ = 161287276627848.

The previous prime is 161287276627847. The next prime is 161287276627859. The reversal of 161287276627849 is 948726672782161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131558261913225 + 29729014714624 = 11469885^2 + 5452432^2 .

It is a cyclic number.

It is not a de Polignac number, because 161287276627849 - 2¹ = 161287276627847 is a prime.

It is a super-3 number, since 3×161287276627849³ (a number of 44 digits) contains 333 as substring.

Together with 161287276627847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161287276627847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80643638313924 + 80643638313925.

It is an arithmetic number, because the mean of its divisors is an integer number (80643638313925).

Almost surely, 2^{161287276627849} is an apocalyptic number.

It is an amenable number.

161287276627849 is a deficient number, since it is larger than the sum of its proper divisors (1).

161287276627849 is an equidigital number, since it uses as much as digits as its factorization.

161287276627849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1365590016, while the sum is 76.

The spelling of 161287276627849 in words is "one hundred sixty-one trillion, two hundred eighty-seven billion, two hundred seventy-six million, six hundred twenty-seven thousand, eight hundred forty-nine".