16421767066553 has 8 divisors (see below), whose sum is σ = 16755921812040. Its totient is φ = 16089707335680.

The previous prime is 16421767066517. The next prime is 16421767066559. The reversal of 16421767066553 is 35566076712461.

It can be written as a sum of positive squares in 4 ways, for example, as 465960507769 + 15955806558784 = 682613^2 + 3994472^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421767066553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16421767066492 and 16421767066501.

It is not an unprimeable number, because it can be changed into a prime (16421767066559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523737818 + ... + 523769171.

It is an arithmetic number, because the mean of its divisors is an integer number (2094490226505).

Almost surely, 2^{16421767066553} is an apocalyptic number.

It is an amenable number.

16421767066553 is a deficient number, since it is larger than the sum of its proper divisors (334154745487).

16421767066553 is a wasteful number, since it uses less digits than its factorization.

16421767066553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047507307.

The product of its (nonzero) digits is 38102400, while the sum is 59.

The spelling of 16421767066553 in words is "sixteen trillion, four hundred twenty-one billion, seven hundred sixty-seven million, sixty-six thousand, five hundred fifty-three".