161965450 has 12 divisors (see below), whose sum is σ = 301255830. Its totient is φ = 64786160.

The previous prime is 161965429. The next prime is 161965487. The reversal of 161965450 is 54569161.

161965450 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 107101801 + 54863649 = 10349^2 + 7407^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1619605 + ... + 1619704.

Almost surely, 2^161965450 is an apocalyptic number.

161965450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161965450 is a deficient number, since it is larger than the sum of its proper divisors (139290380).

161965450 is a wasteful number, since it uses less digits than its factorization.

161965450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239321 (or 3239316 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 161965450 is about 12726.5647368015. The cubic root of 161965450 is about 545.0974210718.

The spelling of 161965450 in words is "one hundred sixty-one million, nine hundred sixty-five thousand, four hundred fifty".