669671987712 has 320 divisors, whose sum is σ = 2197906824960. Its totient is φ = 176443490304.

The previous prime is 669671987693. The next prime is 669671987737. The reversal of 669671987712 is 217789176966.

It is a happy number.

669671987712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×669671987712² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208683964 + ... + 208687172.

It is an arithmetic number, because the mean of its divisors is an integer number (6868458828).

Almost surely, 2^669671987712 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 669671987712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1098953412480).

669671987712 is an abundant number, since it is smaller than the sum of its proper divisors (1528234837248).

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

669671987712 is a wasteful number, since it uses less digits than its factorization.

669671987712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4743 (or 4727 counting only the distinct ones).

The product of its digits is 96018048, while the sum is 69.

The spelling of 669671987712 in words is "six hundred sixty-nine billion, six hundred seventy-one million, nine hundred eighty-seven thousand, seven hundred twelve".