668140081559 has 2 divisors, whose sum is σ = 668140081560. Its totient is φ = 668140081558.

The previous prime is 668140081537. The next prime is 668140081577. The reversal of 668140081559 is 955180041866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668140081559 - 2¹⁶ = 668140016023 is a prime.

It is a super-2 number, since 2×668140081559² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668140081559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668140081519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334070040779 + 334070040780.

It is an arithmetic number, because the mean of its divisors is an integer number (334070040780).

Almost surely, 2^668140081559 is an apocalyptic number.

668140081559 is a deficient number, since it is larger than the sum of its proper divisors (1).

668140081559 is an equidigital number, since it uses as much as digits as its factorization.

668140081559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 668140081559 in words is "six hundred sixty-eight billion, one hundred forty million, eighty-one thousand, five hundred fifty-nine".