16525489669 has 4 divisors (see below), whose sum is σ = 17796681196. Its totient is φ = 15254298144.

The previous prime is 16525489667. The next prime is 16525489711. The reversal of 16525489669 is 96698452561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96698452561 = 1583 ⋅61085567.

It can be written as a sum of positive squares in 2 ways, for example, as 5602522500 + 10922967169 = 74850^2 + 104513^2 .

It is a cyclic number.

It is not a de Polignac number, because 16525489669 - 2¹ = 16525489667 is a prime.

It is a super-2 number, since 2×16525489669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16525489663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635595744 + ... + 635595769.

It is an arithmetic number, because the mean of its divisors is an integer number (4449170299).

Almost surely, 2^16525489669 is an apocalyptic number.

It is an amenable number.

16525489669 is a deficient number, since it is larger than the sum of its proper divisors (1271191527).

16525489669 is a wasteful number, since it uses less digits than its factorization.

16525489669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271191526.

The product of its digits is 27993600, while the sum is 61.

The spelling of 16525489669 in words is "sixteen billion, five hundred twenty-five million, four hundred eighty-nine thousand, six hundred sixty-nine".