216251982499 has 4 divisors (see below), whose sum is σ = 247145122864. Its totient is φ = 185358842136.

The previous prime is 216251982497. The next prime is 216251982581. The reversal of 216251982499 is 994289152612.

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

It is a cyclic number.

It is not a de Polignac number, because 216251982499 - 2¹ = 216251982497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216251982497) 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, 15446570172 + ... + 15446570185.

It is an arithmetic number, because the mean of its divisors is an integer number (61786280716).

Almost surely, 2^216251982499 is an apocalyptic number.

216251982499 is a deficient number, since it is larger than the sum of its proper divisors (30893140365).

216251982499 is an equidigital number, since it uses as much as digits as its factorization.

216251982499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30893140364.

The product of its digits is 5598720, while the sum is 58.

The spelling of 216251982499 in words is "two hundred sixteen billion, two hundred fifty-one million, nine hundred eighty-two thousand, four hundred ninety-nine".