161334554401 has 4 divisors (see below), whose sum is σ = 161335677204. Its totient is φ = 161333431600.

The previous prime is 161334554323. The next prime is 161334554411. The reversal of 161334554401 is 104455433161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6275016225 + 155059538176 = 79215^2 + 393776^2 .

It is a cyclic number.

It is not a de Polignac number, because 161334554401 - 2¹⁵ = 161334521633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161334554411) 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 3 ways as a sum of consecutive naturals, for example, 307630 + ... + 645991.

It is an arithmetic number, because the mean of its divisors is an integer number (40333919301).

Almost surely, 2^161334554401 is an apocalyptic number.

It is an amenable number.

161334554401 is a deficient number, since it is larger than the sum of its proper divisors (1122803).

161334554401 is an equidigital number, since it uses as much as digits as its factorization.

161334554401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122802.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 161334554401 its reverse (104455433161), we get a palindrome (265789987562).

The spelling of 161334554401 in words is "one hundred sixty-one billion, three hundred thirty-four million, five hundred fifty-four thousand, four hundred one".