161621766622 has 4 divisors (see below), whose sum is σ = 242432649936. Its totient is φ = 80810883310.

The previous prime is 161621766599. The next prime is 161621766629. The reversal of 161621766622 is 226667126161.

161621766622 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.

It is a super-2 number, since 2×161621766622² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161621766629) 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 as a sum of consecutive naturals, namely, 40405441654 + ... + 40405441657.

It is an arithmetic number, because the mean of its divisors is an integer number (60608162484).

Almost surely, 2^161621766622 is an apocalyptic number.

161621766622 is a deficient number, since it is larger than the sum of its proper divisors (80810883314).

161621766622 is an equidigital number, since it uses as much as digits as its factorization.

161621766622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80810883313.

The product of its digits is 435456, while the sum is 46.

The spelling of 161621766622 in words is "one hundred sixty-one billion, six hundred twenty-one million, seven hundred sixty-six thousand, six hundred twenty-two".