669814253896840 has 256 divisors, whose sum is σ = 1805234340672000. Its totient is φ = 221153391427584.

The previous prime is 669814253896729. The next prime is 669814253896847. The reversal of 669814253896840 is 48698352418966.

It is a super-2 number, since 2×669814253896840² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (669814253896847) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19239699 + ... + 41349661.

It is an arithmetic number, because the mean of its divisors is an integer number (7051696643250).

Almost surely, 2^{669814253896840} 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 669814253896840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902617170336000).

669814253896840 is an abundant number, since it is smaller than the sum of its proper divisors (1135420086775160).

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

669814253896840 is a wasteful number, since it uses less digits than its factorization.

669814253896840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22110176 (or 22110172 counting only the distinct ones).

The product of its (nonzero) digits is 4299816960, while the sum is 79.

The spelling of 669814253896840 in words is "six hundred sixty-nine trillion, eight hundred fourteen billion, two hundred fifty-three million, eight hundred ninety-six thousand, eight hundred forty".