15216136493 has 4 divisors (see below), whose sum is σ = 15216383868. Its totient is φ = 15215889120.

The previous prime is 15216136487. The next prime is 15216136513. The reversal of 15216136493 is 39463161251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39463161251 = 2339 ⋅16871809.

It can be written as a sum of positive squares in 2 ways, for example, as 6828873769 + 8387262724 = 82637^2 + 91582^2 .

It is a cyclic number.

It is not a de Polignac number, because 15216136493 - 2²⁶ = 15149027629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15216136493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15216136483) 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, 48233 + ... + 180993.

It is an arithmetic number, because the mean of its divisors is an integer number (3804095967).

Almost surely, 2^15216136493 is an apocalyptic number.

It is an amenable number.

15216136493 is a deficient number, since it is larger than the sum of its proper divisors (247375).

15216136493 is a wasteful number, since it uses less digits than its factorization.

15216136493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247374.

The product of its digits is 116640, while the sum is 41.

The spelling of 15216136493 in words is "fifteen billion, two hundred sixteen million, one hundred thirty-six thousand, four hundred ninety-three".