215513415505 has 16 divisors (see below), whose sum is σ = 259373689344. Its totient is φ = 171905866560.

The previous prime is 215513415503. The next prime is 215513415521. The reversal of 215513415505 is 505514315512.

It is not a de Polignac number, because 215513415505 - 2¹ = 215513415503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215513415503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12599739 + ... + 12616831.

It is an arithmetic number, because the mean of its divisors is an integer number (16210855584).

Almost surely, 2^215513415505 is an apocalyptic number.

It is an amenable number.

215513415505 is a deficient number, since it is larger than the sum of its proper divisors (43860273839).

215513415505 is a wasteful number, since it uses less digits than its factorization.

215513415505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24336.

The product of its (nonzero) digits is 75000, while the sum is 37.

The spelling of 215513415505 in words is "two hundred fifteen billion, five hundred thirteen million, four hundred fifteen thousand, five hundred five".