161620122771 has 8 divisors (see below), whose sum is σ = 239437218960. Its totient is φ = 107746748496.

The previous prime is 161620122721. The next prime is 161620122817. The reversal of 161620122771 is 177221026161.

161620122771 is a `hidden beast` number, since 1 + 6 + 1 + 620 + 1 + 2 + 27 + 7 + 1 = 666.

161620122771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161620122771 - 2⁶ = 161620122707 is a prime.

It is a super-2 number, since 2×161620122771² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161620122701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2992965210 + ... + 2992965263.

It is an arithmetic number, because the mean of its divisors is an integer number (29929652370).

Almost surely, 2^161620122771 is an apocalyptic number.

161620122771 is a deficient number, since it is larger than the sum of its proper divisors (77817096189).

161620122771 is an equidigital number, since it uses as much as digits as its factorization.

161620122771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5985930482 (or 5985930476 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The spelling of 161620122771 in words is "one hundred sixty-one billion, six hundred twenty million, one hundred twenty-two thousand, seven hundred seventy-one".