669440016 has 120 divisors (see below), whose sum is σ = 2146719744. Its totient is φ = 190771200.

The previous prime is 669439997. The next prime is 669440017. The reversal of 669440016 is 610044966.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (669440017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 581041 + ... + 582191.

Almost surely, 2^669440016 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 669440016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073359872).

669440016 is an abundant number, since it is smaller than the sum of its proper divisors (1477279728).

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

669440016 is a wasteful number, since it uses less digits than its factorization.

669440016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1740 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 669440016 is about 25873.5389152702. The cubic root of 669440016 is about 874.7901607288.

The spelling of 669440016 in words is "six hundred sixty-nine million, four hundred forty thousand, sixteen".