665168088508 has 48 divisors (see below), whose sum is σ = 1462703284224. Its totient is φ = 257115781440.

The previous prime is 665168088463. The next prime is 665168088509. The reversal of 665168088508 is 805880861566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665168088509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8463391 + ... + 8541622.

It is an arithmetic number, because the mean of its divisors is an integer number (30472985088).

Almost surely, 2^665168088508 is an apocalyptic number.

It is an amenable number.

665168088508 is an abundant number, since it is smaller than the sum of its proper divisors (797535195716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665168088508 is a wasteful number, since it uses less digits than its factorization.

665168088508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17005162 (or 17005160 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 61.

The spelling of 665168088508 in words is "six hundred sixty-five billion, one hundred sixty-eight million, eighty-eight thousand, five hundred eight".