665605522727 has 2 divisors, whose sum is σ = 665605522728. Its totient is φ = 665605522726.

The previous prime is 665605522667. The next prime is 665605522741. The reversal of 665605522727 is 727225506566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665605522727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665605522027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332802761363 + 332802761364.

It is an arithmetic number, because the mean of its divisors is an integer number (332802761364).

Almost surely, 2^665605522727 is an apocalyptic number.

665605522727 is a deficient number, since it is larger than the sum of its proper divisors (1).

665605522727 is an equidigital number, since it uses as much as digits as its factorization.

665605522727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584000, while the sum is 53.

The spelling of 665605522727 in words is "six hundred sixty-five billion, six hundred five million, five hundred twenty-two thousand, seven hundred twenty-seven".