16434888521 has 2 divisors, whose sum is σ = 16434888522. Its totient is φ = 16434888520.

The previous prime is 16434888511. The next prime is 16434888539. The reversal of 16434888521 is 12588843461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14086129225 + 2348759296 = 118685^2 + 48464^2 .

It is a cyclic number.

It is not a de Polignac number, because 16434888521 - 2¹⁴ = 16434872137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16434888521.

It is not a weakly prime, because it can be changed into another prime (16434888511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8217444260 + 8217444261.

It is an arithmetic number, because the mean of its divisors is an integer number (8217444261).

Almost surely, 2^16434888521 is an apocalyptic number.

It is an amenable number.

16434888521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16434888521 is an equidigital number, since it uses as much as digits as its factorization.

16434888521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1474560, while the sum is 50.

The spelling of 16434888521 in words is "sixteen billion, four hundred thirty-four million, eight hundred eighty-eight thousand, five hundred twenty-one".