161688485971 has 2 divisors, whose sum is σ = 161688485972. Its totient is φ = 161688485970.

The previous prime is 161688485867. The next prime is 161688485983. The reversal of 161688485971 is 179584886161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161688485971 - 2⁷ = 161688485843 is a prime.

It is a super-2 number, since 2×161688485971² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161688485471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80844242985 + 80844242986.

It is an arithmetic number, because the mean of its divisors is an integer number (80844242986).

Almost surely, 2^161688485971 is an apocalyptic number.

161688485971 is a deficient number, since it is larger than the sum of its proper divisors (1).

161688485971 is an equidigital number, since it uses as much as digits as its factorization.

161688485971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23224320, while the sum is 64.

The spelling of 161688485971 in words is "one hundred sixty-one billion, six hundred eighty-eight million, four hundred eighty-five thousand, nine hundred seventy-one".