163040081 has 4 divisors (see below), whose sum is σ = 172630692. Its totient is φ = 153449472.

The previous prime is 163040063. The next prime is 163040089. The reversal of 163040081 is 180040361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180040361 = 7069 ⋅25469.

It can be written as a sum of positive squares in 2 ways, for example, as 53523856 + 109516225 = 7316^2 + 10465^2 .

It is a cyclic number.

It is not a de Polignac number, because 163040081 - 2²² = 158845777 is a prime.

It is a super-2 number, since 2×163040081² = 53164136024973122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163040089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4795280 + ... + 4795313.

It is an arithmetic number, because the mean of its divisors is an integer number (43157673).

Almost surely, 2^163040081 is an apocalyptic number.

It is an amenable number.

163040081 is a deficient number, since it is larger than the sum of its proper divisors (9590611).

163040081 is an equidigital number, since it uses as much as digits as its factorization.

163040081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9590610.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 163040081 is about 12768.7149314252. The cubic root of 163040081 is about 546.3003274239.

The spelling of 163040081 in words is "one hundred sixty-three million, forty thousand, eighty-one".