669611335680 has 896 divisors, whose sum is σ = 2763542108160. Its totient is φ = 150652846080.

The previous prime is 669611335669. The next prime is 669611335763. The reversal of 669611335680 is 86533116966.

669611335680 is a `hidden beast` number, since 6 + 6 + 9 + 61 + 13 + 3 + 568 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (896).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 518675835 + ... + 518677125.

Almost surely, 2^669611335680 is an apocalyptic number.

669611335680 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 669611335680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1381771054080).

669611335680 is an abundant number, since it is smaller than the sum of its proper divisors (2093930772480).

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

669611335680 is a wasteful number, since it uses less digits than its factorization.

669611335680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 669611335680 in words is "six hundred sixty-nine billion, six hundred eleven million, three hundred thirty-five thousand, six hundred eighty".