16025412509 has 4 divisors (see below), whose sum is σ = 16458531804. Its totient is φ = 15592293216.

The previous prime is 16025412493. The next prime is 16025412539. The reversal of 16025412509 is 90521452061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11668752484 + 4356660025 = 108022^2 + 66005^2 .

It is a cyclic number.

It is not a de Polignac number, because 16025412509 - 2⁴ = 16025412493 is a prime.

It is a super-2 number, since 2×16025412509² (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 (16025412539) 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 in 3 ways as a sum of consecutive naturals, for example, 216559592 + ... + 216559665.

It is an arithmetic number, because the mean of its divisors is an integer number (4114632951).

Almost surely, 2^16025412509 is an apocalyptic number.

It is an amenable number.

16025412509 is a deficient number, since it is larger than the sum of its proper divisors (433119295).

16025412509 is an equidigital number, since it uses as much as digits as its factorization.

16025412509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433119294.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 16025412509 in words is "sixteen billion, twenty-five million, four hundred twelve thousand, five hundred nine".