16958775421 has 32 divisors (see below), whose sum is σ = 19757334528. Its totient is φ = 14258073600.

The previous prime is 16958775419. The next prime is 16958775437. The reversal of 16958775421 is 12457785961.

It is a cyclic number.

It is not a de Polignac number, because 16958775421 - 2¹ = 16958775419 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 (16958779421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44278596 + ... + 44278978.

It is an arithmetic number, because the mean of its divisors is an integer number (617416704).

Almost surely, 2^16958775421 is an apocalyptic number.

It is an amenable number.

16958775421 is a deficient number, since it is larger than the sum of its proper divisors (2798559107).

16958775421 is a wasteful number, since it uses less digits than its factorization.

16958775421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961.

The product of its digits is 4233600, while the sum is 55.

The spelling of 16958775421 in words is "sixteen billion, nine hundred fifty-eight million, seven hundred seventy-five thousand, four hundred twenty-one".