161786226680 has 64 divisors (see below), whose sum is σ = 396982857600. Its totient is φ = 58980280320.

The previous prime is 161786226643. The next prime is 161786226781. The reversal of 161786226680 is 86622687161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1928081 + ... + 2010240.

It is an arithmetic number, because the mean of its divisors is an integer number (6202857150).

Almost surely, 2^161786226680 is an apocalyptic number.

161786226680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161786226680 is an abundant number, since it is smaller than the sum of its proper divisors (235196630920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161786226680 is a wasteful number, since it uses less digits than its factorization.

161786226680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938424 (or 3938420 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 161786226680 in words is "one hundred sixty-one billion, seven hundred eighty-six million, two hundred twenty-six thousand, six hundred eighty".