15831796553 has 4 divisors (see below), whose sum is σ = 15888137748. Its totient is φ = 15775455360.

The previous prime is 15831796549. The next prime is 15831796573. The reversal of 15831796553 is 35569713851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35569713851 = 7 ⋅5081387693.

It can be written as a sum of positive squares in 2 ways, for example, as 12259582729 + 3572213824 = 110723^2 + 59768^2 .

It is a cyclic number.

It is not a de Polignac number, because 15831796553 - 2² = 15831796549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15831796495 and 15831796504.

It is not an unprimeable number, because it can be changed into a prime (15831796573) 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, 28170176 + ... + 28170737.

It is an arithmetic number, because the mean of its divisors is an integer number (3972034437).

Almost surely, 2^15831796553 is an apocalyptic number.

It is an amenable number.

15831796553 is a deficient number, since it is larger than the sum of its proper divisors (56341195).

15831796553 is an equidigital number, since it uses as much as digits as its factorization.

15831796553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56341194.

The product of its digits is 3402000, while the sum is 53.

The spelling of 15831796553 in words is "fifteen billion, eight hundred thirty-one million, seven hundred ninety-six thousand, five hundred fifty-three".