15403243509 has 6 divisors (see below), whose sum is σ = 22249129526. Its totient is φ = 10268829000.

The previous prime is 15403243489. The next prime is 15403243553. The reversal of 15403243509 is 90534230451.

15403243509 is a `hidden beast` number, since 1 + 5 + 403 + 243 + 5 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14635676484 + 767567025 = 120978^2 + 27705^2 .

It is not a de Polignac number, because 15403243509 - 2¹² = 15403239413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15403243109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 855735742 + ... + 855735759.

Almost surely, 2^15403243509 is an apocalyptic number.

It is an amenable number.

15403243509 is a deficient number, since it is larger than the sum of its proper divisors (6845886017).

15403243509 is a wasteful number, since it uses less digits than its factorization.

15403243509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711471507 (or 1711471504 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 15403243509 in words is "fifteen billion, four hundred three million, two hundred forty-three thousand, five hundred nine".