161311404428 has 12 divisors (see below), whose sum is σ = 282422882112. Its totient is φ = 80619152400.

The previous prime is 161311404413. The next prime is 161311404481. The reversal of 161311404428 is 824404113161.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9127523 + ... + 9145178.

It is an arithmetic number, because the mean of its divisors is an integer number (23535240176).

Almost surely, 2^161311404428 is an apocalyptic number.

It is an amenable number.

161311404428 is a deficient number, since it is larger than the sum of its proper divisors (121111477684).

161311404428 is a wasteful number, since it uses less digits than its factorization.

161311404428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18274912 (or 18274910 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

Adding to 161311404428 its reverse (824404113161), we get a palindrome (985715517589).

The spelling of 161311404428 in words is "one hundred sixty-one billion, three hundred eleven million, four hundred four thousand, four hundred twenty-eight".