16421767066533 has 4 divisors (see below), whose sum is σ = 21895689422048. Its totient is φ = 10947844711020.

The previous prime is 16421767066517. The next prime is 16421767066559. The reversal of 16421767066533 is 33566076712461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16421767066533 - 2⁴ = 16421767066517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421767066513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2736961177753 + ... + 2736961177758.

It is an arithmetic number, because the mean of its divisors is an integer number (5473922355512).

Almost surely, 2^{16421767066533} is an apocalyptic number.

It is an amenable number.

16421767066533 is a deficient number, since it is larger than the sum of its proper divisors (5473922355515).

16421767066533 is an equidigital number, since it uses as much as digits as its factorization.

16421767066533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5473922355514.

The product of its (nonzero) digits is 22861440, while the sum is 57.

The spelling of 16421767066533 in words is "sixteen trillion, four hundred twenty-one billion, seven hundred sixty-seven million, sixty-six thousand, five hundred thirty-three".