161680266667 has 4 divisors (see below), whose sum is σ = 161681194840. Its totient is φ = 161679338496.

The previous prime is 161680266641. The next prime is 161680266697. The reversal of 161680266667 is 766662086161.

161680266667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161680266667 - 2²³ = 161671878059 is a prime.

It is a super-2 number, since 2×161680266667² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161680266697) 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 3 ways as a sum of consecutive naturals, for example, 115542 + ... + 580267.

It is an arithmetic number, because the mean of its divisors is an integer number (40420298710).

Almost surely, 2^161680266667 is an apocalyptic number.

161680266667 is a deficient number, since it is larger than the sum of its proper divisors (928173).

161680266667 is an equidigital number, since it uses as much as digits as its factorization.

161680266667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928172.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 161680266667 in words is "one hundred sixty-one billion, six hundred eighty million, two hundred sixty-six thousand, six hundred sixty-seven".