665168088511 has 4 divisors (see below), whose sum is σ = 665171881024. Its totient is φ = 665164296000.

The previous prime is 665168088509. The next prime is 665168088547. The reversal of 665168088511 is 115880861566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665168088511 - 2¹ = 665168088509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665168088551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619730 + ... + 1988431.

It is an arithmetic number, because the mean of its divisors is an integer number (166292970256).

Almost surely, 2^665168088511 is an apocalyptic number.

665168088511 is a deficient number, since it is larger than the sum of its proper divisors (3792513).

665168088511 is a wasteful number, since it uses less digits than its factorization.

665168088511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792512.

The product of its (nonzero) digits is 2764800, while the sum is 55.

The spelling of 665168088511 in words is "six hundred sixty-five billion, one hundred sixty-eight million, eighty-eight thousand, five hundred eleven".