15439814998609 has 9 divisors (see below), whose sum is σ = 15660623003209. Its totient is φ = 15222077760820.

The previous prime is 15439814998567. The next prime is 15439814998639. The reversal of 15439814998609 is 90689941893451.

It is a happy number.

The square root of 15439814998609 is 3929353.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 15439814998609 - 2⁷ = 15439814998481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15439814998639) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 278956392 + ... + 279011734.

Almost surely, 2^{15439814998609} is an apocalyptic number.

15439814998609 is the 3929353-rd square number.

15439814998609 is the 1964677-th centered octagonal number.

It is an amenable number.

15439814998609 is a deficient number, since it is larger than the sum of its proper divisors (220808004600).

15439814998609 is an frugal number, since it uses more digits than its factorization.

15439814998609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110828 (or 55414 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 76.

The spelling of 15439814998609 in words is "fifteen trillion, four hundred thirty-nine billion, eight hundred fourteen million, nine hundred ninety-eight thousand, six hundred nine".