161253550 has 12 divisors (see below), whose sum is σ = 299931696. Its totient is φ = 64501400.

The previous prime is 161253541. The next prime is 161253553. The reversal of 161253550 is 55352161.

161253550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161253553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1612486 + ... + 1612585.

It is an arithmetic number, because the mean of its divisors is an integer number (24994308).

Almost surely, 2^161253550 is an apocalyptic number.

161253550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161253550 is a deficient number, since it is larger than the sum of its proper divisors (138678146).

161253550 is a wasteful number, since it uses less digits than its factorization.

161253550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3225083 (or 3225078 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 161253550 is about 12698.5648795445. The cubic root of 161253550 is about 544.2976109966.

The spelling of 161253550 in words is "one hundred sixty-one million, two hundred fifty-three thousand, five hundred fifty".