669218703840 has 192 divisors, whose sum is σ = 2350263988800. Its totient is φ = 177848911872.

The previous prime is 669218703823. The next prime is 669218703847. The reversal of 669218703840 is 48307812966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669218703847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1001406 + ... + 1530114.

It is an arithmetic number, because the mean of its divisors is an integer number (12240958275).

Almost surely, 2^669218703840 is an apocalyptic number.

669218703840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669218703840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175131994400).

669218703840 is an abundant number, since it is smaller than the sum of its proper divisors (1681045284960).

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

669218703840 is a wasteful number, since it uses less digits than its factorization.

669218703840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529026 (or 529012 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 669218703840 in words is "six hundred sixty-nine billion, two hundred eighteen million, seven hundred three thousand, eight hundred forty".