161409396780 has 72 divisors (see below), whose sum is σ = 510895842912. Its totient is φ = 41171091456.

The previous prime is 161409396779. The next prime is 161409396793. The reversal of 161409396780 is 87693904161.

161409396780 is a `hidden beast` number, since 161 + 409 + 3 + 9 + 6 + 78 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19489749 + ... + 19498028.

It is an arithmetic number, because the mean of its divisors is an integer number (7095775596).

Almost surely, 2^161409396780 is an apocalyptic number.

161409396780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161409396780 is an abundant number, since it is smaller than the sum of its proper divisors (349486446132).

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

161409396780 is a wasteful number, since it uses less digits than its factorization.

161409396780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38987815 (or 38987810 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 161409396780 in words is "one hundred sixty-one billion, four hundred nine million, three hundred ninety-six thousand, seven hundred eighty".