161311404427 has 8 divisors (see below), whose sum is σ = 164805368832. Its totient is φ = 157820015400.

The previous prime is 161311404413. The next prime is 161311404481. The reversal of 161311404427 is 724404113161.

161311404427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161311404427 - 2¹⁹ = 161310880139 is a prime.

It is a super-2 number, since 2×161311404427² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161311404392 and 161311404401.

It is not an unprimeable number, because it can be changed into a prime (161311404487) 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 7 ways as a sum of consecutive naturals, for example, 516949 + ... + 768022.

It is an arithmetic number, because the mean of its divisors is an integer number (20600671104).

Almost surely, 2^161311404427 is an apocalyptic number.

161311404427 is a deficient number, since it is larger than the sum of its proper divisors (3493964405).

161311404427 is a wasteful number, since it uses less digits than its factorization.

161311404427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287689.

The product of its (nonzero) digits is 16128, while the sum is 34.

Adding to 161311404427 its reverse (724404113161), we get a palindrome (885715517588).

The spelling of 161311404427 in words is "one hundred sixty-one billion, three hundred eleven million, four hundred four thousand, four hundred twenty-seven".