161995450 has 24 divisors (see below), whose sum is σ = 311704380. Its totient is φ = 62563200.

The previous prime is 161995447. The next prime is 161995459. The reversal of 161995450 is 54599161.

It can be written as a sum of positive squares in 6 ways, for example, as 23203489 + 138791961 = 4817^2 + 11781^2 .

It is not an unprimeable number, because it can be changed into a prime (161995459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54411 + ... + 57310.

Almost surely, 2^161995450 is an apocalyptic number.

161995450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161995450 is a deficient number, since it is larger than the sum of its proper divisors (149708930).

161995450 is a wasteful number, since it uses less digits than its factorization.

161995450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111762 (or 111757 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 161995450 is about 12727.7433192220. The cubic root of 161995450 is about 545.1310741607.

The spelling of 161995450 in words is "one hundred sixty-one million, nine hundred ninety-five thousand, four hundred fifty".