1689653600820 has 72 divisors (see below), whose sum is σ = 5201779381344. Its totient is φ = 443849300928.

The previous prime is 1689653600819. The next prime is 1689653600959. The reversal of 1689653600820 is 280063569861.

It is a happy number.

1689653600820 is a `hidden beast` number, since 1 + 6 + 8 + 9 + 6 + 5 + 3 + 600 + 8 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70039914 + ... + 70064033.

It is an arithmetic number, because the mean of its divisors is an integer number (72246935852).

Almost surely, 2^{1689653600820} is an apocalyptic number.

1689653600820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689653600820 is an abundant number, since it is smaller than the sum of its proper divisors (3512125780524).

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

1689653600820 is a wasteful number, since it uses less digits than its factorization.

1689653600820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140104029 (or 140104024 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 1689653600820 in words is "one trillion, six hundred eighty-nine billion, six hundred fifty-three million, six hundred thousand, eight hundred twenty".