665131025011 has 2 divisors, whose sum is σ = 665131025012. Its totient is φ = 665131025010.

The previous prime is 665131024979. The next prime is 665131025017. The reversal of 665131025011 is 110520131566.

It is a happy number.

665131025011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665131025011 - 2⁵ = 665131024979 is a prime.

It is not a weakly prime, because it can be changed into another prime (665131025017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332565512505 + 332565512506.

It is an arithmetic number, because the mean of its divisors is an integer number (332565512506).

Almost surely, 2^665131025011 is an apocalyptic number.

665131025011 is a deficient number, since it is larger than the sum of its proper divisors (1).

665131025011 is an equidigital number, since it uses as much as digits as its factorization.

665131025011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 665131025011 its reverse (110520131566), we get a palindrome (775651156577).

The spelling of 665131025011 in words is "six hundred sixty-five billion, one hundred thirty-one million, twenty-five thousand, eleven".