161028778176 has 168 divisors, whose sum is σ = 527693148320. Its totient is φ = 45991120896.

The previous prime is 161028778153. The next prime is 161028778177. The reversal of 161028778176 is 671877820161.

161028778176 is a `hidden beast` number, since 1 + 610 + 2 + 8 + 7 + 7 + 8 + 17 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (161028778177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14223270 + ... + 14234586.

Almost surely, 2^161028778176 is an apocalyptic number.

161028778176 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161028778176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263846574160).

161028778176 is an abundant number, since it is smaller than the sum of its proper divisors (366664370144).

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

161028778176 is a wasteful number, since it uses less digits than its factorization.

161028778176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14871 (or 14858 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 161028778176 in words is "one hundred sixty-one billion, twenty-eight million, seven hundred seventy-eight thousand, one hundred seventy-six".