216204126977 has 2 divisors, whose sum is σ = 216204126978. Its totient is φ = 216204126976.

The previous prime is 216204126953. The next prime is 216204127057. The reversal of 216204126977 is 779621402612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148474584976 + 67729542001 = 385324^2 + 260249^2 .

It is a cyclic number.

It is not a de Polignac number, because 216204126977 - 2¹⁰ = 216204125953 is a prime.

It is not a weakly prime, because it can be changed into another prime (216204126907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108102063488 + 108102063489.

It is an arithmetic number, because the mean of its divisors is an integer number (108102063489).

Almost surely, 2^216204126977 is an apocalyptic number.

It is an amenable number.

216204126977 is a deficient number, since it is larger than the sum of its proper divisors (1).

216204126977 is an equidigital number, since it uses as much as digits as its factorization.

216204126977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 216204126977 in words is "two hundred sixteen billion, two hundred four million, one hundred twenty-six thousand, nine hundred seventy-seven".