15534575481 has 4 divisors (see below), whose sum is σ = 20712767312. Its totient is φ = 10356383652.

The previous prime is 15534575479. The next prime is 15534575491. The reversal of 15534575481 is 18457543551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15534575481 - 2¹ = 15534575479 is a prime.

It is a super-2 number, since 2×15534575481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15534575481.

It is not an unprimeable number, because it can be changed into a prime (15534575411) 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, 2589095911 + ... + 2589095916.

It is an arithmetic number, because the mean of its divisors is an integer number (5178191828).

Almost surely, 2^15534575481 is an apocalyptic number.

It is an amenable number.

15534575481 is a deficient number, since it is larger than the sum of its proper divisors (5178191831).

15534575481 is an equidigital number, since it uses as much as digits as its factorization.

15534575481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178191830.

The product of its digits is 1680000, while the sum is 48.

The spelling of 15534575481 in words is "fifteen billion, five hundred thirty-four million, five hundred seventy-five thousand, four hundred eighty-one".