16514441521 has 2 divisors, whose sum is σ = 16514441522. Its totient is φ = 16514441520.

The previous prime is 16514441519. The next prime is 16514441539. The reversal of 16514441521 is 12514441561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10076144400 + 6438297121 = 100380^2 + 80239^2 .

It is a cyclic number.

It is not a de Polignac number, because 16514441521 - 2¹ = 16514441519 is a prime.

Together with 16514441519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16514441221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8257220760 + 8257220761.

It is an arithmetic number, because the mean of its divisors is an integer number (8257220761).

Almost surely, 2^16514441521 is an apocalyptic number.

It is an amenable number.

16514441521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16514441521 is an equidigital number, since it uses as much as digits as its factorization.

16514441521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 34.

The spelling of 16514441521 in words is "sixteen billion, five hundred fourteen million, four hundred forty-one thousand, five hundred twenty-one".