665666458133 has 2 divisors, whose sum is σ = 665666458134. Its totient is φ = 665666458132.

The previous prime is 665666458099. The next prime is 665666458139. The reversal of 665666458133 is 331854666566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663284822929 + 2381635204 = 814423^2 + 48802^2 .

It is a cyclic number.

It is not a de Polignac number, because 665666458133 - 2⁶ = 665666458069 is a prime.

It is a super-2 number, since 2×665666458133² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665666458139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332833229066 + 332833229067.

It is an arithmetic number, because the mean of its divisors is an integer number (332833229067).

Almost surely, 2^665666458133 is an apocalyptic number.

It is an amenable number.

665666458133 is a deficient number, since it is larger than the sum of its proper divisors (1).

665666458133 is an equidigital number, since it uses as much as digits as its factorization.

665666458133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55987200, while the sum is 59.

The spelling of 665666458133 in words is "six hundred sixty-five billion, six hundred sixty-six million, four hundred fifty-eight thousand, one hundred thirty-three".