660643423 has 6 divisors (see below), whose sum is σ = 726161912. Its totient is φ = 600584820.

The previous prime is 660643411. The next prime is 660643453. The reversal of 660643423 is 324346066.

It is not a de Polignac number, because 660643423 - 2⁵ = 660643391 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 (660643453) 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 5 ways as a sum of consecutive naturals, for example, 2729811 + ... + 2730052.

Almost surely, 2^660643423 is an apocalyptic number.

660643423 is a deficient number, since it is larger than the sum of its proper divisors (65518489).

660643423 is a wasteful number, since it uses less digits than its factorization.

660643423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459885 (or 5459874 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 660643423 is about 25702.9847099515. The cubic root of 660643423 is about 870.9416074668.

Adding to 660643423 its reverse (324346066), we get a palindrome (984989489).

The spelling of 660643423 in words is "six hundred sixty million, six hundred forty-three thousand, four hundred twenty-three".