195666023533 has 2 divisors, whose sum is σ = 195666023534. Its totient is φ = 195666023532.

The previous prime is 195666023491. The next prime is 195666023557. The reversal of 195666023533 is 335320666591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154699049124 + 40966974409 = 393318^2 + 202403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195666023533 is a prime.

It is a super-3 number, since 3×195666023533³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195666053533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97833011766 + 97833011767.

It is an arithmetic number, because the mean of its divisors is an integer number (97833011767).

Almost surely, 2^195666023533 is an apocalyptic number.

It is an amenable number.

195666023533 is a deficient number, since it is larger than the sum of its proper divisors (1).

195666023533 is an equidigital number, since it uses as much as digits as its factorization.

195666023533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2624400, while the sum is 49.

The spelling of 195666023533 in words is "one hundred ninety-five billion, six hundred sixty-six million, twenty-three thousand, five hundred thirty-three".