16409852621 has 2 divisors, whose sum is σ = 16409852622. Its totient is φ = 16409852620.

The previous prime is 16409852603. The next prime is 16409852653. The reversal of 16409852621 is 12625890461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9592047721 + 6817804900 = 97939^2 + 82570^2 .

It is an emirp because it is prime and its reverse (12625890461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16409852621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16409852521) 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, 8204926310 + 8204926311.

It is an arithmetic number, because the mean of its divisors is an integer number (8204926311).

Almost surely, 2^16409852621 is an apocalyptic number.

It is an amenable number.

16409852621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16409852621 is an equidigital number, since it uses as much as digits as its factorization.

16409852621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 16409852621 in words is "sixteen billion, four hundred nine million, eight hundred fifty-two thousand, six hundred twenty-one".