161606101716561 has 8 divisors (see below), whose sum is σ = 217024980723040. Its totient is φ = 106962311927232.

The previous prime is 161606101716551. The next prime is 161606101716583. The reversal of 161606101716561 is 165617101606161.

161606101716561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161606101716561 - 2⁹ = 161606101716049 is a prime.

It is a super-2 number, since 2×161606101716561² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161606101716561.

It is not an unprimeable number, because it can be changed into a prime (161606101716551) 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, 193772303800 + ... + 193772304633.

It is an arithmetic number, because the mean of its divisors is an integer number (27128122590380).

Almost surely, 2^{161606101716561} is an apocalyptic number.

It is an amenable number.

161606101716561 is a deficient number, since it is larger than the sum of its proper divisors (55418879006479).

161606101716561 is a wasteful number, since it uses less digits than its factorization.

161606101716561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387544608575.

The product of its (nonzero) digits is 272160, while the sum is 48.

The spelling of 161606101716561 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred one million, seven hundred sixteen thousand, five hundred sixty-one".