669462651648 has 1008 divisors, whose sum is σ = 2411246559232. Its totient is φ = 181398528000.

The previous prime is 669462651647. The next prime is 669462651659. The reversal of 669462651648 is 846156264966.

669462651648 is a `hidden beast` number, since 6 + 6 + 9 + 462 + 6 + 5 + 164 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669462651647) 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 111 ways as a sum of consecutive naturals, for example, 2470341753 + ... + 2470342023.

Almost surely, 2^669462651648 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 669462651648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1205623279616).

669462651648 is an abundant number, since it is smaller than the sum of its proper divisors (1741783907584).

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

669462651648 is an equidigital number, since it uses as much as digits as its factorization.

669462651648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 375 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 63.

The spelling of 669462651648 in words is "six hundred sixty-nine billion, four hundred sixty-two million, six hundred fifty-one thousand, six hundred forty-eight".