15540450215 has 8 divisors (see below), whose sum is σ = 18667633680. Its totient is φ = 12419631232.

The previous prime is 15540450209. The next prime is 15540450259. The reversal of 15540450215 is 51205404551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15540450215 - 2¹⁰ = 15540449191 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1585745 + ... + 1595514.

It is an arithmetic number, because the mean of its divisors is an integer number (2333454210).

Almost surely, 2^15540450215 is an apocalyptic number.

15540450215 is a deficient number, since it is larger than the sum of its proper divisors (3127183465).

15540450215 is an equidigital number, since it uses as much as digits as its factorization.

15540450215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3182241.

The product of its (nonzero) digits is 20000, while the sum is 32.

Adding to 15540450215 its reverse (51205404551), we get a palindrome (66745854766).

The spelling of 15540450215 in words is "fifteen billion, five hundred forty million, four hundred fifty thousand, two hundred fifteen".