161788066564 has 96 divisors (see below), whose sum is σ = 311511886560. Its totient is φ = 73216819200.

The previous prime is 161788066541. The next prime is 161788066567. The reversal of 161788066564 is 465660887161.

161788066564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 50358950464 + 111429116100 = 224408^2 + 333810^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 161788066499 and 161788066508.

It is not an unprimeable number, because it can be changed into a prime (161788066567) 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 31 ways as a sum of consecutive naturals, for example, 75991452 + ... + 75993580.

It is an arithmetic number, because the mean of its divisors is an integer number (3244915485).

Almost surely, 2^161788066564 is an apocalyptic number.

It is an amenable number.

161788066564 is a deficient number, since it is larger than the sum of its proper divisors (149723819996).

161788066564 is a wasteful number, since it uses less digits than its factorization.

161788066564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 161788066564 in words is "one hundred sixty-one billion, seven hundred eighty-eight million, sixty-six thousand, five hundred sixty-four".