161505330 has 32 divisors (see below), whose sum is σ = 442986624. Its totient is φ = 36915456.

The previous prime is 161505317. The next prime is 161505341. The reversal of 161505330 is 33505161.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161505330.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384327 + ... + 384746.

It is an arithmetic number, because the mean of its divisors is an integer number (13843332).

Almost surely, 2^161505330 is an apocalyptic number.

161505330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161505330 is an abundant number, since it is smaller than the sum of its proper divisors (281481294).

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

161505330 is a wasteful number, since it uses less digits than its factorization.

161505330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769090.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 161505330 is about 12708.4747314538. The cubic root of 161505330 is about 544.5807509920.

The spelling of 161505330 in words is "one hundred sixty-one million, five hundred five thousand, three hundred thirty".