161066644436 has 12 divisors (see below), whose sum is σ = 285434560320. Its totient is φ = 79513912920.

The previous prime is 161066644421. The next prime is 161066644439. The reversal of 161066644436 is 634446660161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161066644439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254851970 + ... + 254852601.

It is an arithmetic number, because the mean of its divisors is an integer number (23786213360).

Almost surely, 2^161066644436 is an apocalyptic number.

It is an amenable number.

161066644436 is a deficient number, since it is larger than the sum of its proper divisors (124367915884).

161066644436 is a wasteful number, since it uses less digits than its factorization.

161066644436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509704654 (or 509704652 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 161066644436 in words is "one hundred sixty-one billion, sixty-six million, six hundred forty-four thousand, four hundred thirty-six".