161801231336 has 16 divisors (see below), whose sum is σ = 310776755940. Its totient is φ = 78927429760.

The previous prime is 161801231321. The next prime is 161801231353. The reversal of 161801231336 is 633132108161.

It can be written as a sum of positive squares in 2 ways, for example, as 155543472100 + 6257759236 = 394390^2 + 79106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161801231296 and 161801231305.

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, 246647891 + ... + 246648546.

Almost surely, 2^161801231336 is an apocalyptic number.

It is an amenable number.

161801231336 is a deficient number, since it is larger than the sum of its proper divisors (148975524604).

161801231336 is a wasteful number, since it uses less digits than its factorization.

161801231336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493296484 (or 493296480 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

Adding to 161801231336 its reverse (633132108161), we get a palindrome (794933339497).

The spelling of 161801231336 in words is "one hundred sixty-one billion, eight hundred one million, two hundred thirty-one thousand, three hundred thirty-six".