669515616 has 432 divisors, whose sum is σ = 2554493760. Its totient is φ = 164021760.

The previous prime is 669515591. The next prime is 669515617. The reversal of 669515616 is 616515966.

It is a super-3 number, since 3×669515616³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669515617) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2949295 + ... + 2949521.

It is an arithmetic number, because the mean of its divisors is an integer number (5913180).

Almost surely, 2^669515616 is an apocalyptic number.

669515616 is a gapful number since it is divisible by the number (66) 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 669515616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1277246880).

669515616 is an abundant number, since it is smaller than the sum of its proper divisors (1884978144).

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

669515616 is a wasteful number, since it uses less digits than its factorization.

669515616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 269 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 669515616 is about 25874.9998260870. Note that the first 3 decimals coincide. The cubic root of 669515616 is about 874.8230895674.

The spelling of 669515616 in words is "six hundred sixty-nine million, five hundred fifteen thousand, six hundred sixteen".