161404550 has 24 divisors (see below), whose sum is σ = 301802112. Its totient is φ = 64220000.

The previous prime is 161404543. The next prime is 161404561. The reversal of 161404550 is 55404161.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1100 + ... + 18000.

It is an arithmetic number, because the mean of its divisors is an integer number (12575088).

Almost surely, 2^161404550 is an apocalyptic number.

161404550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161404550 is a deficient number, since it is larger than the sum of its proper divisors (140397562).

161404550 is a wasteful number, since it uses less digits than its factorization.

161404550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17104 (or 17099 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 161404550 is about 12704.5090420685. The cubic root of 161404550 is about 544.4674538689.

The spelling of 161404550 in words is "one hundred sixty-one million, four hundred four thousand, five hundred fifty".