16047356621 has 2 divisors, whose sum is σ = 16047356622. Its totient is φ = 16047356620.

The previous prime is 16047356599. The next prime is 16047356639. The reversal of 16047356621 is 12665374061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13042782025 + 3004574596 = 114205^2 + 54814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16047356621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16047356671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8023678310 + 8023678311.

It is an arithmetic number, because the mean of its divisors is an integer number (8023678311).

Almost surely, 2^16047356621 is an apocalyptic number.

It is an amenable number.

16047356621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16047356621 is an equidigital number, since it uses as much as digits as its factorization.

16047356621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 16047356621 in words is "sixteen billion, forty-seven million, three hundred fifty-six thousand, six hundred twenty-one".