216123071509 has 8 divisors (see below), whose sum is σ = 227241254592. Its totient is φ = 205148349120.

The previous prime is 216123071477. The next prime is 216123071609. The reversal of 216123071509 is 905170321612.

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

It is not a de Polignac number, because 216123071509 - 2⁵ = 216123071477 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 (216123071609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35862084 + ... + 35868109.

It is an arithmetic number, because the mean of its divisors is an integer number (28405156824).

Almost surely, 2^216123071509 is an apocalyptic number.

It is an amenable number.

216123071509 is a deficient number, since it is larger than the sum of its proper divisors (11118183083).

216123071509 is a wasteful number, since it uses less digits than its factorization.

216123071509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71730347.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 216123071509 in words is "two hundred sixteen billion, one hundred twenty-three million, seventy-one thousand, five hundred nine".