665605522741 has 2 divisors, whose sum is σ = 665605522742. Its totient is φ = 665605522740.

The previous prime is 665605522727. The next prime is 665605522781. The reversal of 665605522741 is 147225506566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 527299631716 + 138305891025 = 726154^2 + 371895^2 .

It is a cyclic number.

It is not a de Polignac number, because 665605522741 - 2³⁹ = 115849708853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665605522781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332802761370 + 332802761371.

It is an arithmetic number, because the mean of its divisors is an integer number (332802761371).

Almost surely, 2^665605522741 is an apocalyptic number.

It is an amenable number.

665605522741 is a deficient number, since it is larger than the sum of its proper divisors (1).

665605522741 is an equidigital number, since it uses as much as digits as its factorization.

665605522741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024000, while the sum is 49.

The spelling of 665605522741 in words is "six hundred sixty-five billion, six hundred five million, five hundred twenty-two thousand, seven hundred forty-one".