660016501 has 2 divisors, whose sum is σ = 660016502. Its totient is φ = 660016500.

The previous prime is 660016499. The next prime is 660016541. The reversal of 660016501 is 105610066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659976100 + 40401 = 25690^2 + 201^2 .

It is a cyclic number.

It is not a de Polignac number, because 660016501 - 2¹ = 660016499 is a prime.

Together with 660016499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660016541) 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 as a sum of consecutive naturals, namely, 330008250 + 330008251.

It is an arithmetic number, because the mean of its divisors is an integer number (330008251).

Almost surely, 2^660016501 is an apocalyptic number.

It is an amenable number.

660016501 is a deficient number, since it is larger than the sum of its proper divisors (1).

660016501 is an equidigital number, since it uses as much as digits as its factorization.

660016501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 660016501 is about 25690.7863055999. The cubic root of 660016501 is about 870.6660249864. Note that the first 3 decimals are identical.

Adding to 660016501 its reverse (105610066), we get a palindrome (765626567).

The spelling of 660016501 in words is "six hundred sixty million, sixteen thousand, five hundred one".