163240661 has 4 divisors (see below), whose sum is σ = 164152800. Its totient is φ = 162328524.

The previous prime is 163240657. The next prime is 163240673. The reversal of 163240661 is 166042361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163240661 - 2² = 163240657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163240631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455801 + ... + 456158.

It is an arithmetic number, because the mean of its divisors is an integer number (41038200).

Almost surely, 2^163240661 is an apocalyptic number.

It is an amenable number.

163240661 is a deficient number, since it is larger than the sum of its proper divisors (912139).

163240661 is an equidigital number, since it uses as much as digits as its factorization.

163240661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912138.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 163240661 is about 12776.5668706425. The cubic root of 163240661 is about 546.5242642090.

The spelling of 163240661 in words is "one hundred sixty-three million, two hundred forty thousand, six hundred sixty-one".