161506116556 has 24 divisors (see below), whose sum is σ = 301701576960. Its totient is φ = 75425389200.

The previous prime is 161506116553. The next prime is 161506116631. The reversal of 161506116556 is 655611605161.

It is a super-2 number, since 2×161506116556² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161506116553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14959960 + ... + 14970751.

It is an arithmetic number, because the mean of its divisors is an integer number (12570899040).

Almost surely, 2^161506116556 is an apocalyptic number.

It is an amenable number.

161506116556 is a deficient number, since it is larger than the sum of its proper divisors (140195460404).

161506116556 is a wasteful number, since it uses less digits than its factorization.

161506116556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29930805 (or 29930803 counting only the distinct ones).

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

The spelling of 161506116556 in words is "one hundred sixty-one billion, five hundred six million, one hundred sixteen thousand, five hundred fifty-six".