216887707109 has 4 divisors (see below), whose sum is σ = 216888667104. Its totient is φ = 216886747116.

The previous prime is 216887707103. The next prime is 216887707133. The reversal of 216887707109 is 901707788612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216887707109 - 2¹⁶ = 216887641573 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 (216887707103) 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, 65654 + ... + 661880.

It is an arithmetic number, because the mean of its divisors is an integer number (54222166776).

Almost surely, 2^216887707109 is an apocalyptic number.

It is an amenable number.

216887707109 is a deficient number, since it is larger than the sum of its proper divisors (959995).

216887707109 is an equidigital number, since it uses as much as digits as its factorization.

216887707109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959994.

The product of its (nonzero) digits is 2370816, while the sum is 56.

The spelling of 216887707109 in words is "two hundred sixteen billion, eight hundred eighty-seven million, seven hundred seven thousand, one hundred nine".