163505540 has 48 divisors (see below), whose sum is σ = 383733504. Its totient is φ = 58003200.

The previous prime is 163505533. The next prime is 163505543. The reversal of 163505540 is 45505361.

It is a super-2 number, since 2×163505540² = 53468123221383200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163505543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44 + ... + 18083.

It is an arithmetic number, because the mean of its divisors is an integer number (7994448).

Almost surely, 2^163505540 is an apocalyptic number.

163505540 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 163505540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191866752).

163505540 is an abundant number, since it is smaller than the sum of its proper divisors (220227964).

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

163505540 is a wasteful number, since it uses less digits than its factorization.

163505540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18188 (or 18186 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 163505540 is about 12786.9284818521. The cubic root of 163505540 is about 546.8197064749.

The spelling of 163505540 in words is "one hundred sixty-three million, five hundred five thousand, five hundred forty".