161213443475722 has 64 divisors (see below), whose sum is σ = 280144534746240. Its totient is φ = 68765171558400.

The previous prime is 161213443475681. The next prime is 161213443475729. The reversal of 161213443475722 is 227574344312161.

It is a self number, because there is not a number n which added to its sum of digits gives 161213443475722.

It is not an unprimeable number, because it can be changed into a prime (161213443475729) 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, 2787732304 + ... + 2787790132.

It is an arithmetic number, because the mean of its divisors is an integer number (4377258355410).

Almost surely, 2^{161213443475722} is an apocalyptic number.

161213443475722 is a deficient number, since it is larger than the sum of its proper divisors (118931091270518).

161213443475722 is a wasteful number, since it uses less digits than its factorization.

161213443475722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79687.

The product of its digits is 6773760, while the sum is 52.

Adding to 161213443475722 its reverse (227574344312161), we get a palindrome (388787787787883).

The spelling of 161213443475722 in words is "one hundred sixty-one trillion, two hundred thirteen billion, four hundred forty-three million, four hundred seventy-five thousand, seven hundred twenty-two".