161606115556 has 12 divisors (see below), whose sum is σ = 282821781760. Its totient is φ = 80799892200.

The previous prime is 161606115529. The next prime is 161606115557. The reversal of 161606115556 is 655511606161.

It is a super-2 number, since 2×161606115556² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161606115557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674616 + ... + 882223.

Almost surely, 2^161606115556 is an apocalyptic number.

It is an amenable number.

161606115556 is a deficient number, since it is larger than the sum of its proper divisors (121215666204).

161606115556 is a wasteful number, since it uses less digits than its factorization.

161606115556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582794 (or 1582792 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 161606115556 in words is "one hundred sixty-one billion, six hundred six million, one hundred fifteen thousand, five hundred fifty-six".