665168088551 has 2 divisors, whose sum is σ = 665168088552. Its totient is φ = 665168088550.

The previous prime is 665168088547. The next prime is 665168088587. The reversal of 665168088551 is 155880861566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665168088551 - 2² = 665168088547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665168088451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332584044275 + 332584044276.

It is an arithmetic number, because the mean of its divisors is an integer number (332584044276).

Almost surely, 2^665168088551 is an apocalyptic number.

665168088551 is a deficient number, since it is larger than the sum of its proper divisors (1).

665168088551 is an equidigital number, since it uses as much as digits as its factorization.

665168088551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824000, while the sum is 59.

The spelling of 665168088551 in words is "six hundred sixty-five billion, one hundred sixty-eight million, eighty-eight thousand, five hundred fifty-one".