660506020639 has 2 divisors, whose sum is σ = 660506020640. Its totient is φ = 660506020638.

The previous prime is 660506020583. The next prime is 660506020703. The reversal of 660506020639 is 936020605066.

It is a happy number.

660506020639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660506020639 - 2⁷ = 660506020511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 660506020595 and 660506020604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660506020039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330253010319 + 330253010320.

It is an arithmetic number, because the mean of its divisors is an integer number (330253010320).

Almost surely, 2^660506020639 is an apocalyptic number.

660506020639 is a deficient number, since it is larger than the sum of its proper divisors (1).

660506020639 is an equidigital number, since it uses as much as digits as its factorization.

660506020639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 43.

The spelling of 660506020639 in words is "six hundred sixty billion, five hundred six million, twenty thousand, six hundred thirty-nine".