15545113513 has 4 divisors (see below), whose sum is σ = 16081151940. Its totient is φ = 15009075088.

The previous prime is 15545113499. The next prime is 15545113583. The reversal of 15545113513 is 31531154551.

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 8367126784 + 7177986729 = 91472^2 + 84723^2 .

It is a cyclic number.

It is not a de Polignac number, because 15545113513 - 2²¹ = 15543016361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15545113583) 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, 268019170 + ... + 268019227.

It is an arithmetic number, because the mean of its divisors is an integer number (4020287985).

Almost surely, 2^15545113513 is an apocalyptic number.

It is an amenable number.

15545113513 is a deficient number, since it is larger than the sum of its proper divisors (536038427).

15545113513 is an equidigital number, since it uses as much as digits as its factorization.

15545113513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536038426.

The product of its digits is 22500, while the sum is 34.

The spelling of 15545113513 in words is "fifteen billion, five hundred forty-five million, one hundred thirteen thousand, five hundred thirteen".