16042521569 has 2 divisors, whose sum is σ = 16042521570. Its totient is φ = 16042521568.

The previous prime is 16042521559. The next prime is 16042521589. The reversal of 16042521569 is 96512524061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12235014544 + 3807507025 = 110612^2 + 61705^2 .

It is a cyclic number.

It is not a de Polignac number, because 16042521569 - 2⁴ = 16042521553 is a prime.

It is a super-2 number, since 2×16042521569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16042521559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8021260784 + 8021260785.

It is an arithmetic number, because the mean of its divisors is an integer number (8021260785).

Almost surely, 2^16042521569 is an apocalyptic number.

It is an amenable number.

16042521569 is a deficient number, since it is larger than the sum of its proper divisors (1).

16042521569 is an equidigital number, since it uses as much as digits as its factorization.

16042521569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 16042521569 in words is "sixteen billion, forty-two million, five hundred twenty-one thousand, five hundred sixty-nine".