660865279968 has 144 divisors (see below), whose sum is σ = 1883883246336. Its totient is φ = 219756176640.

The previous prime is 660865279951. The next prime is 660865279979. The reversal of 660865279968 is 869972568066.

660865279968 is a `hidden beast` number, since 6 + 6 + 0 + 8 + 6 + 527 + 9 + 96 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 660865279896 and 660865279905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 353214073 + ... + 353215943.

It is an arithmetic number, because the mean of its divisors is an integer number (13082522544).

Almost surely, 2^660865279968 is an apocalyptic number.

It is an amenable number.

660865279968 is an abundant number, since it is smaller than the sum of its proper divisors (1223017966368).

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

660865279968 is a wasteful number, since it uses less digits than its factorization.

660865279968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197 (or 4186 counting only the distinct ones).

The product of its (nonzero) digits is 470292480, while the sum is 72.

The spelling of 660865279968 in words is "six hundred sixty billion, eight hundred sixty-five million, two hundred seventy-nine thousand, nine hundred sixty-eight".