161606010566091 has 128 divisors (see below), whose sum is σ = 271949932800000. Its totient is φ = 83098996125696.

The previous prime is 161606010566071. The next prime is 161606010566149. The reversal of 161606010566091 is 190665010606161.

It is not a de Polignac number, because 161606010566091 - 2⁵ = 161606010566059 is a prime.

It is a super-2 number, since 2×161606010566091² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161606010566091.

It is not an unprimeable number, because it can be changed into a prime (161606010566051) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1471110135 + ... + 1471219983.

It is an arithmetic number, because the mean of its divisors is an integer number (2124608850000).

Almost surely, 2^{161606010566091} is an apocalyptic number.

161606010566091 is a deficient number, since it is larger than the sum of its proper divisors (110343922233909).

161606010566091 is a wasteful number, since it uses less digits than its factorization.

161606010566091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110693.

The product of its (nonzero) digits is 349920, while the sum is 48.

The spelling of 161606010566091 in words is "one hundred sixty-one trillion, six hundred six billion, ten million, five hundred sixty-six thousand, ninety-one".