15540540013 has 4 divisors (see below), whose sum is σ = 15541526880. Its totient is φ = 15539553148.

The previous prime is 15540540007. The next prime is 15540540023. The reversal of 15540540013 is 31004504551.

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 a cyclic number.

It is not a de Polignac number, because 15540540013 - 2⁹ = 15540539501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540540023) 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, 469423 + ... + 501436.

It is an arithmetic number, because the mean of its divisors is an integer number (3885381720).

Almost surely, 2^15540540013 is an apocalyptic number.

It is an amenable number.

15540540013 is a deficient number, since it is larger than the sum of its proper divisors (986867).

15540540013 is an equidigital number, since it uses as much as digits as its factorization.

15540540013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986866.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 15540540013 in words is "fifteen billion, five hundred forty million, five hundred forty thousand, thirteen".