161277968 has 40 divisors (see below), whose sum is σ = 324633240. Its totient is φ = 77552640.

The previous prime is 161277967. The next prime is 161277971. The reversal of 161277968 is 869772161.

It can be written as a sum of positive squares in 4 ways, for example, as 73068304 + 88209664 = 8548^2 + 9392^2 .

It is not an unprimeable number, because it can be changed into a prime (161277967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51158 + ... + 54218.

It is an arithmetic number, because the mean of its divisors is an integer number (8115831).

Almost surely, 2^161277968 is an apocalyptic number.

It is an amenable number.

161277968 is an abundant number, since it is smaller than the sum of its proper divisors (163355272).

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

161277968 is a wasteful number, since it uses less digits than its factorization.

161277968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195 (or 3189 counting only the distinct ones).

The product of its digits is 254016, while the sum is 47.

The square root of 161277968 is about 12699.5262903779. The cubic root of 161277968 is about 544.3250832357.

The spelling of 161277968 in words is "one hundred sixty-one million, two hundred seventy-seven thousand, nine hundred sixty-eight".