669244069440 has 336 divisors, whose sum is σ = 2353562894592. Its totient is φ = 174470012928.

The previous prime is 669244069423. The next prime is 669244069441. The reversal of 669244069440 is 44960442966.

It is a happy number.

669244069440 is a `hidden beast` number, since 66 + 92 + 4 + 406 + 94 + 4 + 0 = 666.

It is a super-2 number, since 2×669244069440² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (669244069441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148487667 + ... + 148492173.

It is an arithmetic number, because the mean of its divisors is an integer number (7004651472).

Almost surely, 2^669244069440 is an apocalyptic number.

669244069440 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 669244069440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176781447296).

669244069440 is an abundant number, since it is smaller than the sum of its proper divisors (1684318825152).

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

669244069440 is a wasteful number, since it uses less digits than its factorization.

669244069440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5674 (or 5661 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 669244069440 in words is "six hundred sixty-nine billion, two hundred forty-four million, sixty-nine thousand, four hundred forty".