667841420800 has 120 divisors (see below), whose sum is σ = 1679327411256. Its totient is φ = 263149117440.

The previous prime is 667841420789. The next prime is 667841420801. The reversal of 667841420800 is 8024148766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667841420801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 468234 + ... + 1246966.

Almost surely, 2^667841420800 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 667841420800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839663705628).

667841420800 is an abundant number, since it is smaller than the sum of its proper divisors (1011485990456).

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

667841420800 is an equidigital number, since it uses as much as digits as its factorization.

667841420800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778828 (or 778807 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 667841420800 in words is "six hundred sixty-seven billion, eight hundred forty-one million, four hundred twenty thousand, eight hundred".