161776345920 has 168 divisors, whose sum is σ = 597499647264. Its totient is φ = 36977439744.

The previous prime is 161776345919. The next prime is 161776345949. The reversal of 161776345920 is 29543677161.

It is a tau number, because it is divible by the number of its divisors (168).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1672522 + ... + 1766601.

Almost surely, 2^161776345920 is an apocalyptic number.

161776345920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161776345920 is an abundant number, since it is smaller than the sum of its proper divisors (435723301344).

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

161776345920 is a wasteful number, since it uses less digits than its factorization.

161776345920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439157 (or 3439140 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 161776345920 in words is "one hundred sixty-one billion, seven hundred seventy-six million, three hundred forty-five thousand, nine hundred twenty".