20076766649 has 2 divisors, whose sum is σ = 20076766650. Its totient is φ = 20076766648.

The previous prime is 20076766643. The next prime is 20076766753. The reversal of 20076766649 is 94666767002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12289939600 + 7786827049 = 110860^2 + 88243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20076766649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20076766649.

It is not a weakly prime, because it can be changed into another prime (20076766643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10038383324 + 10038383325.

It is an arithmetic number, because the mean of its divisors is an integer number (10038383325).

Almost surely, 2^20076766649 is an apocalyptic number.

It is an amenable number.

20076766649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20076766649 is an equidigital number, since it uses as much as digits as its factorization.

20076766649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 53.

The spelling of 20076766649 in words is "twenty billion, seventy-six million, seven hundred sixty-six thousand, six hundred forty-nine".