161277065280 has 280 divisors, whose sum is σ = 574151074200. Its totient is φ = 42972733440.

The previous prime is 161277065269. The next prime is 161277065293. The reversal of 161277065280 is 82560772161.

161277065280 is a `hidden beast` number, since 1 + 612 + 7 + 7 + 0 + 6 + 5 + 28 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18011787264 + 143265278016 = 134208^2 + 378504^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63269446 + ... + 63271994.

Almost surely, 2^161277065280 is an apocalyptic number.

161277065280 is a gapful number since it is divisible by the number (10) 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 161277065280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287075537100).

161277065280 is an abundant number, since it is smaller than the sum of its proper divisors (412874008920).

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

161277065280 is a wasteful number, since it uses less digits than its factorization.

161277065280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5019 (or 5000 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 161277065280 in words is "one hundred sixty-one billion, two hundred seventy-seven million, sixty-five thousand, two hundred eighty".