216435723769 has 2 divisors, whose sum is σ = 216435723770. Its totient is φ = 216435723768.

The previous prime is 216435723617. The next prime is 216435723787. The reversal of 216435723769 is 967327534612.

It is a happy number.

216435723769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151200434025 + 65235289744 = 388845^2 + 255412^2 .

It is a cyclic number.

It is not a de Polignac number, because 216435723769 - 2¹⁵ = 216435691001 is a prime.

It is a super-2 number, since 2×216435723769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216435723269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108217861884 + 108217861885.

It is an arithmetic number, because the mean of its divisors is an integer number (108217861885).

Almost surely, 2^216435723769 is an apocalyptic number.

It is an amenable number.

216435723769 is a deficient number, since it is larger than the sum of its proper divisors (1).

216435723769 is an equidigital number, since it uses as much as digits as its factorization.

216435723769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 55.

The spelling of 216435723769 in words is "two hundred sixteen billion, four hundred thirty-five million, seven hundred twenty-three thousand, seven hundred sixty-nine".