161837835481 has 6 divisors (see below), whose sum is σ = 188260339290. Its totient is φ = 138718144656.

The previous prime is 161837835473. The next prime is 161837835491. The reversal of 161837835481 is 184538738161.

161837835481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 150198878025 + 11638957456 = 387555^2 + 107884^2 .

It is not a de Polignac number, because 161837835481 - 2³ = 161837835473 is a prime.

It is a super-2 number, since 2×161837835481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161837835491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1651406436 + ... + 1651406533.

It is an arithmetic number, because the mean of its divisors is an integer number (31376723215).

Almost surely, 2^161837835481 is an apocalyptic number.

It is an amenable number.

161837835481 is a deficient number, since it is larger than the sum of its proper divisors (26422503809).

161837835481 is an equidigital number, since it uses as much as digits as its factorization.

161837835481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302812983 (or 3302812976 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 55.

The spelling of 161837835481 in words is "one hundred sixty-one billion, eight hundred thirty-seven million, eight hundred thirty-five thousand, four hundred eighty-one".