665115060997 has 2 divisors, whose sum is σ = 665115060998. Its totient is φ = 665115060996.

The previous prime is 665115060947. The next prime is 665115061057. The reversal of 665115060997 is 799060511566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 343942369156 + 321172691841 = 586466^2 + 566721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665115060997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665115060947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332557530498 + 332557530499.

It is an arithmetic number, because the mean of its divisors is an integer number (332557530499).

Almost surely, 2^665115060997 is an apocalyptic number.

It is an amenable number.

665115060997 is a deficient number, since it is larger than the sum of its proper divisors (1).

665115060997 is an equidigital number, since it uses as much as digits as its factorization.

665115060997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The spelling of 665115060997 in words is "six hundred sixty-five billion, one hundred fifteen million, sixty thousand, nine hundred ninety-seven".