161606105551571 has 16 divisors (see below), whose sum is σ = 166762998528000. Its totient is φ = 156528086240448.

The previous prime is 161606105551523. The next prime is 161606105551609. The reversal of 161606105551571 is 175155501606161.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161606105551571 is a prime.

It is a super-2 number, since 2×161606105551571² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161606105554571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37470971 + ... + 41560628.

It is an arithmetic number, because the mean of its divisors is an integer number (10422687408000).

Almost surely, 2^{161606105551571} is an apocalyptic number.

161606105551571 is a deficient number, since it is larger than the sum of its proper divisors (5156892976429).

161606105551571 is a wasteful number, since it uses less digits than its factorization.

161606105551571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79032098.

The product of its (nonzero) digits is 945000, while the sum is 50.

The spelling of 161606105551571 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred five million, five hundred fifty-one thousand, five hundred seventy-one".