669346560 has 216 divisors, whose sum is σ = 2343650400. Its totient is φ = 176357376.

The previous prime is 669346553. The next prime is 669346589. The reversal of 669346560 is 65643966.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1117141 + ... + 1117739.

Almost surely, 2^669346560 is an apocalyptic number.

669346560 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 669346560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171825200).

669346560 is an abundant number, since it is smaller than the sum of its proper divisors (1674303840).

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

669346560 is a wasteful number, since it uses less digits than its factorization.

669346560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The square root of 669346560 is about 25871.7328372106. The cubic root of 669346560 is about 874.7494509853.

The spelling of 669346560 in words is "six hundred sixty-nine million, three hundred forty-six thousand, five hundred sixty".