660541623 has 16 divisors (see below), whose sum is σ = 1050302976. Its totient is φ = 361041120.

The previous prime is 660541621. The next prime is 660541627. The reversal of 660541623 is 326145066.

It is not a de Polignac number, because 660541623 - 2¹ = 660541621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660541621) 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 15 ways as a sum of consecutive naturals, for example, 683308 + ... + 684273.

It is an arithmetic number, because the mean of its divisors is an integer number (65643936).

Almost surely, 2^660541623 is an apocalyptic number.

660541623 is a deficient number, since it is larger than the sum of its proper divisors (389761353).

660541623 is a wasteful number, since it uses less digits than its factorization.

660541623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367614.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 660541623 is about 25701.0043188977. The cubic root of 660541623 is about 870.8968700654.

Adding to 660541623 its reverse (326145066), we get a palindrome (986686689).

The spelling of 660541623 in words is "six hundred sixty million, five hundred forty-one thousand, six hundred twenty-three".