161277996 has 72 divisors (see below), whose sum is σ = 427098112. Its totient is φ = 47282400.

The previous prime is 161277979. The next prime is 161278003. The reversal of 161277996 is 699772161.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43221 + ... + 46803.

Almost surely, 2^161277996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161277996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213549056).

161277996 is an abundant number, since it is smaller than the sum of its proper divisors (265820116).

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

161277996 is a wasteful number, since it uses less digits than its factorization.

161277996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643 (or 3630 counting only the distinct ones).

The product of its digits is 285768, while the sum is 48.

The square root of 161277996 is about 12699.5273927812. The cubic root of 161277996 is about 544.3251147364.

The spelling of 161277996 in words is "one hundred sixty-one million, two hundred seventy-seven thousand, nine hundred ninety-six".