16455006521 has 2 divisors, whose sum is σ = 16455006522. Its totient is φ = 16455006520.

The previous prime is 16455006509. The next prime is 16455006583. The reversal of 16455006521 is 12560055461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8401738921 + 8053267600 = 91661^2 + 89740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16455006521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16455026521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8227503260 + 8227503261.

It is an arithmetic number, because the mean of its divisors is an integer number (8227503261).

Almost surely, 2^16455006521 is an apocalyptic number.

It is an amenable number.

16455006521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16455006521 is an equidigital number, since it uses as much as digits as its factorization.

16455006521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 16455006521 in words is "sixteen billion, four hundred fifty-five million, six thousand, five hundred twenty-one".