216441625061 has 2 divisors, whose sum is σ = 216441625062. Its totient is φ = 216441625060.

The previous prime is 216441625039. The next prime is 216441625129. The reversal of 216441625061 is 160526144612.

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., 191130724225 + 25310900836 = 437185^2 + 159094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216441625061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216441655061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108220812530 + 108220812531.

It is an arithmetic number, because the mean of its divisors is an integer number (108220812531).

Almost surely, 2^216441625061 is an apocalyptic number.

It is an amenable number.

216441625061 is a deficient number, since it is larger than the sum of its proper divisors (1).

216441625061 is an equidigital number, since it uses as much as digits as its factorization.

216441625061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 216441625061 its reverse (160526144612), we get a palindrome (376967769673).

The spelling of 216441625061 in words is "two hundred sixteen billion, four hundred forty-one million, six hundred twenty-five thousand, sixty-one".