667897681783320 has 64 divisors (see below), whose sum is σ = 2226325605948000. Its totient is φ = 178106048475264.

The previous prime is 667897681783303. The next prime is 667897681783447. The reversal of 667897681783320 is 23387186798766.

667897681783320 is a `hidden beast` number, since 6 + 6 + 7 + 89 + 76 + 81 + 78 + 3 + 320 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 667897681783320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309211888635 + ... + 309211890794.

Almost surely, 2^{667897681783320} is an apocalyptic number.

667897681783320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667897681783320 is an abundant number, since it is smaller than the sum of its proper divisors (1558427924164680).

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

667897681783320 is a wasteful number, since it uses less digits than its factorization.

667897681783320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618423779449 (or 618423779439 counting only the distinct ones).

The product of its (nonzero) digits is 6145155072, while the sum is 81.

The spelling of 667897681783320 in words is "six hundred sixty-seven trillion, eight hundred ninety-seven billion, six hundred eighty-one million, seven hundred eighty-three thousand, three hundred twenty".