161580582 has 80 divisors (see below), whose sum is σ = 374319792. Its totient is φ = 52073280.

The previous prime is 161580581. The next prime is 161580583. The reversal of 161580582 is 285085161.

It is an interprime number because it is at equal distance from previous prime (161580581) and next prime (161580583).

It is a super-2 number, since 2×161580582² = 52216568958917448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161580581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 820108 + ... + 820304.

Almost surely, 2^161580582 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161580582, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187159896).

161580582 is an abundant number, since it is smaller than the sum of its proper divisors (212739210).

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

161580582 is a wasteful number, since it uses less digits than its factorization.

161580582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 161580582 is about 12711.4350881401. The cubic root of 161580582 is about 544.6653187427.

The spelling of 161580582 in words is "one hundred sixty-one million, five hundred eighty thousand, five hundred eighty-two".