161203521316 has 6 divisors (see below), whose sum is σ = 282106162310. Its totient is φ = 80601760656.

The previous prime is 161203521289. The next prime is 161203521331. The reversal of 161203521316 is 613125302161.

It can be written as a sum of positive squares in only one way, i.e., 138269447716 + 22934073600 = 371846^2 + 151440^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20150440161 + ... + 20150440168.

Almost surely, 2^161203521316 is an apocalyptic number.

It is an amenable number.

161203521316 is a deficient number, since it is larger than the sum of its proper divisors (120902640994).

161203521316 is a wasteful number, since it uses less digits than its factorization.

161203521316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40300880333 (or 40300880331 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 161203521316 its reverse (613125302161), we get a palindrome (774328823477).

The spelling of 161203521316 in words is "one hundred sixty-one billion, two hundred three million, five hundred twenty-one thousand, three hundred sixteen".