667701388816 has 320 divisors, whose sum is σ = 1674151133184. Its totient is φ = 252569940480.

The previous prime is 667701388801. The next prime is 667701388817. The reversal of 667701388816 is 618883107766.

It is a happy number.

It is a super-3 number, since 3×667701388816³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (667701388817) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1100001985 + ... + 1100002591.

Almost surely, 2^667701388816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667701388816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837075566592).

667701388816 is an abundant number, since it is smaller than the sum of its proper divisors (1006449744368).

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

667701388816 is a wasteful number, since it uses less digits than its factorization.

667701388816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 667701388816 in words is "six hundred sixty-seven billion, seven hundred one million, three hundred eighty-eight thousand, eight hundred sixteen".