665525277941 has 2 divisors, whose sum is σ = 665525277942. Its totient is φ = 665525277940.

The previous prime is 665525277931. The next prime is 665525277947. The reversal of 665525277941 is 149772525566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391964897041 + 273560380900 = 626071^2 + 523030^2 .

It is a cyclic number.

It is not a de Polignac number, because 665525277941 - 2³⁰ = 664451536117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665525277947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332762638970 + 332762638971.

It is an arithmetic number, because the mean of its divisors is an integer number (332762638971).

Almost surely, 2^665525277941 is an apocalyptic number.

It is an amenable number.

665525277941 is a deficient number, since it is larger than the sum of its proper divisors (1).

665525277941 is an equidigital number, since it uses as much as digits as its factorization.

665525277941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752000, while the sum is 59.

The spelling of 665525277941 in words is "six hundred sixty-five billion, five hundred twenty-five million, two hundred seventy-seven thousand, nine hundred forty-one".