669511680 has 208 divisors, whose sum is σ = 2271724704. Its totient is φ = 167772160.

The previous prime is 669511657. The next prime is 669511691. The reversal of 669511680 is 86115966.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1044160 + ... + 1044800.

Almost surely, 2^669511680 is an apocalyptic number.

669511680 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 669511680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135862352).

669511680 is an abundant number, since it is smaller than the sum of its proper divisors (1602213024).

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

669511680 is a wasteful number, since it uses less digits than its factorization.

669511680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 669511680 is about 25874.9237680036. The cubic root of 669511680 is about 874.8213752382.

The spelling of 669511680 in words is "six hundred sixty-nine million, five hundred eleven thousand, six hundred eighty".