215981855015 has 8 divisors (see below), whose sum is σ = 259362179280. Its totient is φ = 172662848512.

The previous prime is 215981855009. The next prime is 215981855057. The reversal of 215981855015 is 510558189512.

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 215981855015 - 2²⁰ = 215980806439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15321689 + ... + 15335778.

It is an arithmetic number, because the mean of its divisors is an integer number (32420272410).

Almost surely, 2^215981855015 is an apocalyptic number.

215981855015 is a deficient number, since it is larger than the sum of its proper divisors (43380324265).

215981855015 is a wasteful number, since it uses less digits than its factorization.

215981855015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30658881.

The product of its (nonzero) digits is 720000, while the sum is 50.

The spelling of 215981855015 in words is "two hundred fifteen billion, nine hundred eighty-one million, eight hundred fifty-five thousand, fifteen".