20559467077 has 2 divisors, whose sum is σ = 20559467078. Its totient is φ = 20559467076.

The previous prime is 20559467057. The next prime is 20559467081. The reversal of 20559467077 is 77076495502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15863654401 + 4695812676 = 125951^2 + 68526^2 .

It is a cyclic number.

It is not a de Polignac number, because 20559467077 - 2¹⁵ = 20559434309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20559467017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10279733538 + 10279733539.

It is an arithmetic number, because the mean of its divisors is an integer number (10279733539).

Almost surely, 2^20559467077 is an apocalyptic number.

It is an amenable number.

20559467077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20559467077 is an equidigital number, since it uses as much as digits as its factorization.

20559467077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 20559467077 in words is "twenty billion, five hundred fifty-nine million, four hundred sixty-seven thousand, seventy-seven".