161642817606 has 16 divisors (see below), whose sum is σ = 324452734704. Its totient is φ = 53686422624.

The previous prime is 161642817577. The next prime is 161642817653. The reversal of 161642817606 is 606718246161.

It is a happy number.

It is a super-2 number, since 2×161642817606² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48627345 + ... + 48630668.

It is an arithmetic number, because the mean of its divisors is an integer number (20278295919).

Almost surely, 2^161642817606 is an apocalyptic number.

161642817606 is an abundant number, since it is smaller than the sum of its proper divisors (162809917098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161642817606 is a wasteful number, since it uses less digits than its factorization.

161642817606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97258295.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 161642817606 in words is "one hundred sixty-one billion, six hundred forty-two million, eight hundred seventeen thousand, six hundred six".