216444863669 has 2 divisors, whose sum is σ = 216444863670. Its totient is φ = 216444863668.

The previous prime is 216444863653. The next prime is 216444863711. The reversal of 216444863669 is 966368444612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216048336100 + 396527569 = 464810^2 + 19913^2 .

It is a cyclic number.

It is not a de Polignac number, because 216444863669 - 2⁴ = 216444863653 is a prime.

It is a super-2 number, since 2×216444863669² (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 (216444865669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108222431834 + 108222431835.

It is an arithmetic number, because the mean of its divisors is an integer number (108222431835).

Almost surely, 2^216444863669 is an apocalyptic number.

It is an amenable number.

216444863669 is a deficient number, since it is larger than the sum of its proper divisors (1).

216444863669 is an equidigital number, since it uses as much as digits as its factorization.

216444863669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35831808, while the sum is 59.

The spelling of 216444863669 in words is "two hundred sixteen billion, four hundred forty-four million, eight hundred sixty-three thousand, six hundred sixty-nine".