660722423 has 2 divisors, whose sum is σ = 660722424. Its totient is φ = 660722422.

The previous prime is 660722417. The next prime is 660722441. The reversal of 660722423 is 324227066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660722423 - 2¹² = 660718327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660722423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660722483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330361211 + 330361212.

It is an arithmetic number, because the mean of its divisors is an integer number (330361212).

Almost surely, 2^660722423 is an apocalyptic number.

660722423 is a deficient number, since it is larger than the sum of its proper divisors (1).

660722423 is an equidigital number, since it uses as much as digits as its factorization.

660722423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 660722423 is about 25704.5214505153. The cubic root of 660722423 is about 870.9763219296.

Adding to 660722423 its reverse (324227066), we get a palindrome (984949489).

The spelling of 660722423 in words is "six hundred sixty million, seven hundred twenty-two thousand, four hundred twenty-three".