161805552 has 40 divisors (see below), whose sum is σ = 436174464. Its totient is φ = 51589824.

The previous prime is 161805503. The next prime is 161805559. The reversal of 161805552 is 255508161.

161805552 is digitally balanced in base 2, 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 (161805559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72178 + ... + 74385.

Almost surely, 2^161805552 is an apocalyptic number.

161805552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161805552 is an abundant number, since it is smaller than the sum of its proper divisors (274368912).

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

161805552 is a wasteful number, since it uses less digits than its factorization.

161805552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146597 (or 146591 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 161805552 is about 12720.2811289688. The cubic root of 161805552 is about 544.9179822148.

The spelling of 161805552 in words is "one hundred sixty-one million, eight hundred five thousand, five hundred fifty-two".