669615660000 has 900 divisors, whose sum is σ = 2824036887672. Its totient is φ = 153055008000.

The previous prime is 669615659989. The next prime is 669615660001. The reversal of 669615660000 is 66516966.

It is a tau number, because it is divible by the number of its divisors (900).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669615660001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 149 ways as a sum of consecutive naturals, for example, 95659379997 + ... + 95659380003.

Almost surely, 2^669615660000 is an apocalyptic number.

669615660000 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 669615660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1412018443836).

669615660000 is an abundant number, since it is smaller than the sum of its proper divisors (2154421227672).

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

669615660000 is an frugal number, since it uses more digits than its factorization.

669615660000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 669615660000 in words is "six hundred sixty-nine billion, six hundred fifteen million, six hundred sixty thousand".