660423161 has 4 divisors (see below), whose sum is σ = 660940800. Its totient is φ = 659905524.

The previous prime is 660423103. The next prime is 660423217. The reversal of 660423161 is 161324066.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161324066 = 2 ⋅80662033.

It is a cyclic number.

It is not a de Polignac number, because 660423161 - 2¹⁴ = 660406777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660423661) 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, 256901 + ... + 259458.

It is an arithmetic number, because the mean of its divisors is an integer number (165235200).

Almost surely, 2^660423161 is an apocalyptic number.

It is an amenable number.

660423161 is a deficient number, since it is larger than the sum of its proper divisors (517639).

660423161 is a wasteful number, since it uses less digits than its factorization.

660423161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517638.

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

The square root of 660423161 is about 25698.6995974505. The cubic root of 660423161 is about 870.8448045334.

The spelling of 660423161 in words is "six hundred sixty million, four hundred twenty-three thousand, one hundred sixty-one".