665909108914 has 32 divisors (see below), whose sum is σ = 1197555321600. Its totient is φ = 271667618880.

The previous prime is 665909108899. The next prime is 665909108927. The reversal of 665909108914 is 419801909566.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11521669 + ... + 11579320.

It is an arithmetic number, because the mean of its divisors is an integer number (37423603800).

Almost surely, 2^665909108914 is an apocalyptic number.

665909108914 is a deficient number, since it is larger than the sum of its proper divisors (531646212686).

665909108914 is a wasteful number, since it uses less digits than its factorization.

665909108914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23101098.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 665909108914 in words is "six hundred sixty-five billion, nine hundred nine million, one hundred eight thousand, nine hundred fourteen".