669802371840 has 1296 divisors, whose sum is σ = 2876342047488. Its totient is φ = 142987493376.

The previous prime is 669802371781. The next prime is 669802371841. The reversal of 669802371840 is 48173208966.

It is not an unprimeable number, because it can be changed into a prime (669802371841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2139943524 + ... + 2139943836.

It is an arithmetic number, because the mean of its divisors is an integer number (2219399728).

Almost surely, 2^669802371840 is an apocalyptic number.

669802371840 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 669802371840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1438171023744).

669802371840 is an abundant number, since it is smaller than the sum of its proper divisors (2206539675648).

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

669802371840 is a wasteful number, since it uses less digits than its factorization.

669802371840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 570 counting only the distinct ones).

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

The spelling of 669802371840 in words is "six hundred sixty-nine billion, eight hundred two million, three hundred seventy-one thousand, eight hundred forty".