216731513014415 has 24 divisors (see below), whose sum is σ = 302544555207120. Its totient is φ = 148613411280768.

The previous prime is 216731513014411. The next prime is 216731513014543. The reversal of 216731513014415 is 514410315137612.

216731513014415 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 14721804²-1.

It is not a de Polignac number, because 216731513014415 - 2² = 216731513014411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216731513014411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7360904 + ... + 22082706.

It is an arithmetic number, because the mean of its divisors is an integer number (12606023133630).

Almost surely, 2^{216731513014415} is an apocalyptic number.

216731513014415 is a deficient number, since it is larger than the sum of its proper divisors (85813042192705).

216731513014415 is a wasteful number, since it uses less digits than its factorization.

216731513014415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14781911 (or 14781904 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 216731513014415 in words is "two hundred sixteen trillion, seven hundred thirty-one billion, five hundred thirteen million, fourteen thousand, four hundred fifteen".