665478918948 has 24 divisors (see below), whose sum is σ = 1554698820640. Its totient is φ = 221552781120.

The previous prime is 665478918889. The next prime is 665478918961. The reversal of 665478918948 is 849819874566.

It is a self number, because there is not a number n which added to its sum of digits gives 665478918948.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34180513 + ... + 34199976.

Almost surely, 2^665478918948 is an apocalyptic number.

It is an amenable number.

665478918948 is an abundant number, since it is smaller than the sum of its proper divisors (889219901692).

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

665478918948 is a wasteful number, since it uses less digits than its factorization.

665478918948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68381307 (or 68381305 counting only the distinct ones).

The product of its digits is 836075520, while the sum is 75.

The spelling of 665478918948 in words is "six hundred sixty-five billion, four hundred seventy-eight million, nine hundred eighteen thousand, nine hundred forty-eight".