16530614621 has 2 divisors, whose sum is σ = 16530614622. Its totient is φ = 16530614620.

The previous prime is 16530614609. The next prime is 16530614641. The reversal of 16530614621 is 12641603561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11498272900 + 5032341721 = 107230^2 + 70939^2 .

It is a cyclic number.

It is not a de Polignac number, because 16530614621 - 2⁶ = 16530614557 is a prime.

It is a super-2 number, since 2×16530614621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16530614641) 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 as a sum of consecutive naturals, namely, 8265307310 + 8265307311.

It is an arithmetic number, because the mean of its divisors is an integer number (8265307311).

Almost surely, 2^16530614621 is an apocalyptic number.

It is an amenable number.

16530614621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16530614621 is an equidigital number, since it uses as much as digits as its factorization.

16530614621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 16530614621 in words is "sixteen billion, five hundred thirty million, six hundred fourteen thousand, six hundred twenty-one".