161522002404 has 135 divisors (see below), whose sum is σ = 476660698787. Its totient is φ = 46115384112.

The previous prime is 161522002333. The next prime is 161522002423. The reversal of 161522002404 is 404200225161.

The square root of 161522002404 is 401898.

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

161522002404 is a `hidden beast` number, since 1 + 6 + 1 + 52 + 200 + 2 + 404 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 118157329 + ... + 118158695.

Almost surely, 2^161522002404 is an apocalyptic number.

161522002404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161522002404 is the 401898-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161522002404

161522002404 is an abundant number, since it is smaller than the sum of its proper divisors (315138696383).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161522002404 is an frugal number, since it uses more digits than its factorization.

161522002404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772 (or 1379 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 161522002404 its reverse (404200225161), we get a palindrome (565722227565).

The spelling of 161522002404 in words is "one hundred sixty-one billion, five hundred twenty-two million, two thousand, four hundred four".