15540749547 has 4 divisors (see below), whose sum is σ = 20720999400. Its totient is φ = 10360499696.

The previous prime is 15540749537. The next prime is 15540749573. The reversal of 15540749547 is 74594704551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74594704551 = 3 ⋅24864901517.

It is a cyclic number.

It is not a de Polignac number, because 15540749547 - 2¹⁰ = 15540748523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15540749547.

It is not an unprimeable number, because it can be changed into a prime (15540749527) 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, 2590124922 + ... + 2590124927.

It is an arithmetic number, because the mean of its divisors is an integer number (5180249850).

Almost surely, 2^15540749547 is an apocalyptic number.

15540749547 is a deficient number, since it is larger than the sum of its proper divisors (5180249853).

15540749547 is an equidigital number, since it uses as much as digits as its factorization.

15540749547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180249852.

The product of its (nonzero) digits is 3528000, while the sum is 51.

The spelling of 15540749547 in words is "fifteen billion, five hundred forty million, seven hundred forty-nine thousand, five hundred forty-seven".