669945960 has 192 divisors, whose sum is σ = 2267066880. Its totient is φ = 171394560.

The previous prime is 669945953. The next prime is 669945967. The reversal of 669945960 is 69549966.

It is a happy number.

669945960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (669945953) and next prime (669945967).

It is a junction number, because it is equal to n+sod(n) for n = 669945897 and 669945906.

It is not an unprimeable number, because it can be changed into a prime (669945967) 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, 1930507 + ... + 1930853.

It is an arithmetic number, because the mean of its divisors is an integer number (11807640).

Almost surely, 2^669945960 is an apocalyptic number.

669945960 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 669945960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1133533440).

669945960 is an abundant number, since it is smaller than the sum of its proper divisors (1597120920).

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

669945960 is a wasteful number, since it uses less digits than its factorization.

669945960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The square root of 669945960 is about 25883.3143163699. The cubic root of 669945960 is about 875.0104858607.

The spelling of 669945960 in words is "six hundred sixty-nine million, nine hundred forty-five thousand, nine hundred sixty".