161620500406312 has 24 divisors (see below), whose sum is σ = 319827271412250. Its totient is φ = 76557079138464.

The previous prime is 161620500406271. The next prime is 161620500406373. The reversal of 161620500406312 is 213604005026161.

It can be written as a sum of positive squares in only one way, i.e., 158065593787396 + 3554906618916 = 12572414^2 + 1885446^2 .

It is a super-2 number, since 2×161620500406312² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27981385687 + ... + 27981391462.

Almost surely, 2^{161620500406312} is an apocalyptic number.

It is an amenable number.

161620500406312 is a deficient number, since it is larger than the sum of its proper divisors (158206771005938).

161620500406312 is a wasteful number, since it uses less digits than its factorization.

161620500406312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55962777193 (or 55962777170 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 161620500406312 in words is "one hundred sixty-one trillion, six hundred twenty billion, five hundred million, four hundred six thousand, three hundred twelve".