216502474261 has 2 divisors, whose sum is σ = 216502474262. Its totient is φ = 216502474260.

The previous prime is 216502474217. The next prime is 216502474267. The reversal of 216502474261 is 162474205612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215881966161 + 620508100 = 464631^2 + 24910^2 .

It is a cyclic number.

It is not a de Polignac number, because 216502474261 - 2³¹ = 214354990613 is a prime.

It is a super-2 number, since 2×216502474261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216502474267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108251237130 + 108251237131.

It is an arithmetic number, because the mean of its divisors is an integer number (108251237131).

Almost surely, 2^216502474261 is an apocalyptic number.

It is an amenable number.

216502474261 is a deficient number, since it is larger than the sum of its proper divisors (1).

216502474261 is an equidigital number, since it uses as much as digits as its factorization.

216502474261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 40.

Adding to 216502474261 its reverse (162474205612), we get a palindrome (378976679873).

The spelling of 216502474261 in words is "two hundred sixteen billion, five hundred two million, four hundred seventy-four thousand, two hundred sixty-one".