660423423 has 16 divisors (see below), whose sum is σ = 961047936. Its totient is φ = 400076640.

The previous prime is 660423389. The next prime is 660423457. The reversal of 660423423 is 324324066.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (660423389) and next prime (660423457).

It is not a de Polignac number, because 660423423 - 2⁹ = 660422911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660423493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129936 + ... + 134922.

It is an arithmetic number, because the mean of its divisors is an integer number (60065496).

Almost surely, 2^660423423 is an apocalyptic number.

660423423 is a deficient number, since it is larger than the sum of its proper divisors (300624513).

660423423 is a wasteful number, since it uses less digits than its factorization.

660423423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9014.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 660423423 is about 25698.7046949841. The cubic root of 660423423 is about 870.8449196925.

Adding to 660423423 its reverse (324324066), we get a palindrome (984747489).

The spelling of 660423423 in words is "six hundred sixty million, four hundred twenty-three thousand, four hundred twenty-three".