216514123473509 has 4 divisors (see below), whose sum is σ = 217967238396300. Its totient is φ = 215061008550720.

The previous prime is 216514123473377. The next prime is 216514123473517. The reversal of 216514123473509 is 905374321415612.

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 35691722805025 + 180822400668484 = 5974255^2 + 13447022^2 .

It is a cyclic number.

It is not a de Polignac number, because 216514123473509 - 2⁸ = 216514123473253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216514123473569) 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, 726557461172 + ... + 726557461469.

It is an arithmetic number, because the mean of its divisors is an integer number (54491809599075).

Almost surely, 2^{216514123473509} is an apocalyptic number.

It is an amenable number.

216514123473509 is a deficient number, since it is larger than the sum of its proper divisors (1453114922791).

216514123473509 is a wasteful number, since it uses less digits than its factorization.

216514123473509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453114922790.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 216514123473509 in words is "two hundred sixteen trillion, five hundred fourteen billion, one hundred twenty-three million, four hundred seventy-three thousand, five hundred nine".