16526878421 has 2 divisors, whose sum is σ = 16526878422. Its totient is φ = 16526878420.

The previous prime is 16526878363. The next prime is 16526878451. The reversal of 16526878421 is 12487862561.

16526878421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15521671396 + 1005207025 = 124586^2 + 31705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16526878421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16526878421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16526878451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8263439210 + 8263439211.

It is an arithmetic number, because the mean of its divisors is an integer number (8263439211).

Almost surely, 2^16526878421 is an apocalyptic number.

It is an amenable number.

16526878421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16526878421 is an equidigital number, since it uses as much as digits as its factorization.

16526878421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 50.

The spelling of 16526878421 in words is "sixteen billion, five hundred twenty-six million, eight hundred seventy-eight thousand, four hundred twenty-one".