215715611217 has 16 divisors (see below), whose sum is σ = 306222239232. Its totient is φ = 134603170560.

The previous prime is 215715611207. The next prime is 215715611233. The reversal of 215715611217 is 712116517512.

It is not a de Polignac number, because 215715611217 - 2³¹ = 213568127569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215715611207) 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, 11675073 + ... + 11693534.

It is an arithmetic number, because the mean of its divisors is an integer number (19138889952).

Almost surely, 2^215715611217 is an apocalyptic number.

It is an amenable number.

215715611217 is a deficient number, since it is larger than the sum of its proper divisors (90506628015).

215715611217 is a wasteful number, since it uses less digits than its factorization.

215715611217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23368808.

The product of its digits is 29400, while the sum is 39.

The spelling of 215715611217 in words is "two hundred fifteen billion, seven hundred fifteen million, six hundred eleven thousand, two hundred seventeen".