161381480726644 has 6 divisors (see below), whose sum is σ = 282417591271634. Its totient is φ = 80690740363320.

The previous prime is 161381480726569. The next prime is 161381480726777. The reversal of 161381480726644 is 446627084183161.

It can be written as a sum of positive squares in only one way, i.e., 151010427276900 + 10371053449744 = 12288630^2 + 3220412^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20172685090827 + ... + 20172685090834.

Almost surely, 2^{161381480726644} is an apocalyptic number.

It is an amenable number.

161381480726644 is a deficient number, since it is larger than the sum of its proper divisors (121036110544990).

161381480726644 is a wasteful number, since it uses less digits than its factorization.

161381480726644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40345370181665 (or 40345370181663 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 61.

The spelling of 161381480726644 in words is "one hundred sixty-one trillion, three hundred eighty-one billion, four hundred eighty million, seven hundred twenty-six thousand, six hundred forty-four".