216115616531 has 8 divisors (see below), whose sum is σ = 230779747200. Its totient is φ = 201932277120.

The previous prime is 216115616513. The next prime is 216115616543. The reversal of 216115616531 is 135616511612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216115616531 is a prime.

It is a super-2 number, since 2×216115616531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216115616131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120196886 + ... + 120198683.

It is an arithmetic number, because the mean of its divisors is an integer number (28847468400).

Almost surely, 2^216115616531 is an apocalyptic number.

216115616531 is a deficient number, since it is larger than the sum of its proper divisors (14664130669).

216115616531 is a wasteful number, since it uses less digits than its factorization.

216115616531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240395629.

The product of its digits is 32400, while the sum is 38.

The spelling of 216115616531 in words is "two hundred sixteen billion, one hundred fifteen million, six hundred sixteen thousand, five hundred thirty-one".