216787637713 has 2 divisors, whose sum is σ = 216787637714. Its totient is φ = 216787637712.

The previous prime is 216787637701. The next prime is 216787637743. The reversal of 216787637713 is 317736787612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192951983169 + 23835654544 = 439263^2 + 154388^2 .

It is a cyclic number.

It is not a de Polignac number, because 216787637713 - 2⁵ = 216787637681 is a prime.

It is not a weakly prime, because it can be changed into another prime (216787637743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108393818856 + 108393818857.

It is an arithmetic number, because the mean of its divisors is an integer number (108393818857).

Almost surely, 2^216787637713 is an apocalyptic number.

It is an amenable number.

216787637713 is a deficient number, since it is larger than the sum of its proper divisors (1).

216787637713 is an equidigital number, since it uses as much as digits as its factorization.

216787637713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12446784, while the sum is 58.

The spelling of 216787637713 in words is "two hundred sixteen billion, seven hundred eighty-seven million, six hundred thirty-seven thousand, seven hundred thirteen".