161563040 has 96 divisors (see below), whose sum is σ = 407949696. Its totient is φ = 60318720.

The previous prime is 161563033. The next prime is 161563057. The reversal of 161563040 is 40365161.

It is a super-2 number, since 2×161563040² = 52205231788083200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157730 + ... + 158750.

It is an arithmetic number, because the mean of its divisors is an integer number (4249476).

Almost surely, 2^161563040 is an apocalyptic number.

161563040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161563040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203974848).

161563040 is an abundant number, since it is smaller than the sum of its proper divisors (246386656).

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

161563040 is a wasteful number, since it uses less digits than its factorization.

161563040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 161563040 is about 12710.7450607744. The cubic root of 161563040 is about 544.6456074946.

The spelling of 161563040 in words is "one hundred sixty-one million, five hundred sixty-three thousand, forty".