161363693401 has 9 divisors (see below), whose sum is σ = 162695715381. Its totient is φ = 160042498812.

The previous prime is 161363693347. The next prime is 161363693437. The reversal of 161363693401 is 104396363161.

The square root of 161363693401 is 401701.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 161363693401 - 2¹³ = 161363685209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161363693441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 51014446 + ... + 51017608.

It is an arithmetic number, because the mean of its divisors is an integer number (18077301709).

Almost surely, 2^161363693401 is an apocalyptic number.

161363693401 is the 401701-st square number.

161363693401 is the 200851-st centered octagonal number.

It is an amenable number.

161363693401 is a deficient number, since it is larger than the sum of its proper divisors (1332021980).

161363693401 is an frugal number, since it uses more digits than its factorization.

161363693401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580 (or 3290 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 161363693401 in words is "one hundred sixty-one billion, three hundred sixty-three million, six hundred ninety-three thousand, four hundred one".