161012550 has 48 divisors (see below), whose sum is σ = 405880272. Its totient is φ = 42230400.

The previous prime is 161012539. The next prime is 161012563. The reversal of 161012550 is 55210161.

161012550 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 an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 352 + ... + 17948.

It is an arithmetic number, because the mean of its divisors is an integer number (8455839).

Almost surely, 2^161012550 is an apocalyptic number.

161012550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161012550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202940136).

161012550 is an abundant number, since it is smaller than the sum of its proper divisors (244867722).

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

161012550 is a wasteful number, since it uses less digits than its factorization.

161012550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17673 (or 17668 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 161012550 is about 12689.0720700924. The cubic root of 161012550 is about 544.0263174804.

The spelling of 161012550 in words is "one hundred sixty-one million, twelve thousand, five hundred fifty".