216037639969 has 2 divisors, whose sum is σ = 216037639970. Its totient is φ = 216037639968.

The previous prime is 216037639913. The next prime is 216037639991. The reversal of 216037639969 is 969936730612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174462429969 + 41575210000 = 417687^2 + 203900^2 .

It is a cyclic number.

It is not a de Polignac number, because 216037639969 - 2⁹ = 216037639457 is a prime.

It is a super-2 number, since 2×216037639969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216037630969) 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, 108018819984 + 108018819985.

It is an arithmetic number, because the mean of its divisors is an integer number (108018819985).

Almost surely, 2^216037639969 is an apocalyptic number.

It is an amenable number.

216037639969 is a deficient number, since it is larger than the sum of its proper divisors (1).

216037639969 is an equidigital number, since it uses as much as digits as its factorization.

216037639969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19840464, while the sum is 61.

The spelling of 216037639969 in words is "two hundred sixteen billion, thirty-seven million, six hundred thirty-nine thousand, nine hundred sixty-nine".