20666466049 has 2 divisors, whose sum is σ = 20666466050. Its totient is φ = 20666466048.

The previous prime is 20666466001. The next prime is 20666466059. The reversal of 20666466049 is 94066466602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20411265424 + 255200625 = 142868^2 + 15975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20666466049 - 2²⁹ = 20129595137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20666465993 and 20666466011.

It is not a weakly prime, because it can be changed into another prime (20666466059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10333233024 + 10333233025.

It is an arithmetic number, because the mean of its divisors is an integer number (10333233025).

Almost surely, 2^20666466049 is an apocalyptic number.

It is an amenable number.

20666466049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20666466049 is an equidigital number, since it uses as much as digits as its factorization.

20666466049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 49.

The spelling of 20666466049 in words is "twenty billion, six hundred sixty-six million, four hundred sixty-six thousand, forty-nine".