161312656 has 20 divisors (see below), whose sum is σ = 313038000. Its totient is φ = 80528672.

The previous prime is 161312629. The next prime is 161312687. The reversal of 161312656 is 656213161.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2895 + ... + 18193.

It is an arithmetic number, because the mean of its divisors is an integer number (15651900).

Almost surely, 2^161312656 is an apocalyptic number.

161312656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161312656 is a deficient number, since it is larger than the sum of its proper divisors (151725344).

161312656 is a wasteful number, since it uses less digits than its factorization.

161312656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15966 (or 15960 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 161312656 is about 12700.8919371830. The cubic root of 161312656 is about 544.3641052943.

The spelling of 161312656 in words is "one hundred sixty-one million, three hundred twelve thousand, six hundred fifty-six".