216731513014417 has 4 divisors (see below), whose sum is σ = 224205013463220. Its totient is φ = 209258012565616.

The previous prime is 216731513014411. The next prime is 216731513014543. The reversal of 216731513014417 is 714410315137612.

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

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113648733499456 + 103082779514961 = 10660616^2 + 10152969^2 .

It is a cyclic number.

It is not a de Polignac number, because 216731513014417 - 2³ = 216731513014409 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 3736750224358 + ... + 3736750224415.

It is an arithmetic number, because the mean of its divisors is an integer number (56051253365805).

Almost surely, 2^{216731513014417} is an apocalyptic number.

It is an amenable number.

216731513014417 is a deficient number, since it is larger than the sum of its proper divisors (7473500448803).

216731513014417 is an equidigital number, since it uses as much as digits as its factorization.

216731513014417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7473500448802.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 216731513014417 in words is "two hundred sixteen trillion, seven hundred thirty-one billion, five hundred thirteen million, fourteen thousand, four hundred seventeen".