216035746272781 has 2 divisors, whose sum is σ = 216035746272782. Its totient is φ = 216035746272780.

The previous prime is 216035746272757. The next prime is 216035746272817. The reversal of 216035746272781 is 187272647530612.

Together with next prime (216035746272817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182847431807881 + 33188314464900 = 13522109^2 + 5760930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216035746272781 is a prime.

It is a super-2 number, since 2×216035746272781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216035746272701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108017873136390 + 108017873136391.

It is an arithmetic number, because the mean of its divisors is an integer number (108017873136391).

Almost surely, 2^{216035746272781} is an apocalyptic number.

It is an amenable number.

216035746272781 is a deficient number, since it is larger than the sum of its proper divisors (1).

216035746272781 is an equidigital number, since it uses as much as digits as its factorization.

216035746272781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 216035746272781 in words is "two hundred sixteen trillion, thirty-five billion, seven hundred forty-six million, two hundred seventy-two thousand, seven hundred eighty-one".