216707507052509 has 32 divisors (see below), whose sum is σ = 238781471685120. Its totient is φ = 195039361036800.

The previous prime is 216707507052493. The next prime is 216707507052511. The reversal of 216707507052509 is 905250705707612.

It is a cyclic number.

It is not a de Polignac number, because 216707507052509 - 2⁴ = 216707507052493 is a prime.

It is a super-2 number, since 2×216707507052509² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216707507055509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1604971169 + ... + 1605106185.

It is an arithmetic number, because the mean of its divisors is an integer number (7461920990160).

Almost surely, 2^{216707507052509} is an apocalyptic number.

It is an amenable number.

216707507052509 is a deficient number, since it is larger than the sum of its proper divisors (22073964632611).

216707507052509 is a wasteful number, since it uses less digits than its factorization.

216707507052509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138821.

The product of its (nonzero) digits is 9261000, while the sum is 56.

The spelling of 216707507052509 in words is "two hundred sixteen trillion, seven hundred seven billion, five hundred seven million, fifty-two thousand, five hundred nine".