16677034921 has 2 divisors, whose sum is σ = 16677034922. Its totient is φ = 16677034920.

The previous prime is 16677034919. The next prime is 16677034943. The reversal of 16677034921 is 12943077661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12935877696 + 3741157225 = 113736^2 + 61165^2 .

It is a cyclic number.

It is not a de Polignac number, because 16677034921 - 2¹ = 16677034919 is a prime.

Together with 16677034919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16677034951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8338517460 + 8338517461.

It is an arithmetic number, because the mean of its divisors is an integer number (8338517461).

Almost surely, 2^16677034921 is an apocalyptic number.

It is an amenable number.

16677034921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16677034921 is an equidigital number, since it uses as much as digits as its factorization.

16677034921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 16677034921 in words is "sixteen billion, six hundred seventy-seven million, thirty-four thousand, nine hundred twenty-one".